Tree/Shrub Seed Germination - Quick Reference

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Only representative temperate zone species are listed in each of the cultivated genera. If your species is not listed, select a germination method to try from the same genus. If the genus is not listed, vegetative propagation may be preferred.  Names in green are common names.  Zone numbers refer to minimum hardiness for that species, if known.  See references at the end of the page for best information.

Abelia x grandiflora , Glossy abelia ,zone= 6, sow seed outdoors at time of collection, do not put seed into storage
Abeliophyllum distichum , White forsythia ,zone= 5, sow seed outdoors at time of collection, do not put seed into storage
Abies amabilis , Cascade Fir ,zone= 5, sow 4 wks @ 39ºF, move to 70ºF for germ.
Abies balsamea , Balsam Fir ,zone= 2, sow 4 wks @ 39ºF, move to 70ºF for germ.
Abies concolor , White Fir ,zone= 4 , sow 4 wks @ 39ºF, move to 70ºF for germ.
Abies fraseri , Fraser Balsam Fir ,zone= 4 , sow 4 wks @ 39ºF, move to 70ºF for germ.
Abies koreana , Korean Fir ,zone= 5 , sow 4 wks @ 39ºF, move to 70ºF for germ. in darkness
Abies nordmanniana , Nordman Fir ,zone= 4 , sow 4 wks @ 39ºF, move to 70ºF for germ. in darkness
Abies procera , Noble Fir ,zone= 5 , sow @ 70ºF, if no germ. after 30d, move to 39ºF for 4 wks, return to 70ºF for           germ.
Abies veitchii , Veitch's Fir ,zone= 3 , sow 4 wks @ 39ºF, move to 70ºF for germ. in darkness
Acanthopanax sieboldianus , Fiveleaf aralia ,zone= 4 , sow 6m @ 70ºF, then 3m @ 39ºF, recycle
Acer buergerianum , Trident Maple ,zone= 6 , sow @ 39ºF for germ. in 6 to 8 weeks
Acer campestre , Field Maple ,zone= 4 , sow 4 wks @ 70ºF, move to 39ºF for germ. in 3 to 6 months
Acer capillipes , Red Snake Bark Maple ,zone=   see A. pensylvanicum
Acer carpinifolium , Hornbeam Maple ,zone= 5 , sow 4 wks @ 70ºF, move to 39ºF for germ. in 3 to 6 months
Acer cissifolium , ,zone= 6 , sow 4 wks @ 70ºF, move to 39ºF for germ. in 3 to 6 months
Acer crataegifolium , Hawthorn Maple ,zone= 7 , sow 3m @ 39ºF, then remove seed coats and move to 70ºF for germ.
Acer davidii , Fr.david's Maple ,zone= 5 , see A. pensylvanicum
Acer ginnala , Amur maple ,zone= 2 , sow @ 39ºF for germ. in 3 to 4 months
Acer griseum , Paperbark Maple ,zone= 5 , soak, then scarify, sow 3m @ 39ºF, move to 70ºF for germ. (less than 10% viable seeds)
Acer japonicum , Japanese maple ,zone= ? , sow 3m @ 39ºF, then remove seed coats and move to 70ºF for germ.
Acer mandschuricum , Manchurian maple ,zone= 4 , see A. griseum
Acer negundo , Box Elder Maple ,zone= 2 , Scratch and soak, sow 3m @ 39ºF, move to 70ºF for germ.
Acer nikoense , Nikko Maple ,zone= 5 , see A. griseum
Acer palmatum , Japanese maple ,zone= 5 , seed should be collected from the tree before it dries, then sown directly outdoors for germ. the following spring.
Acer pensylvanicum , Striped Maple ,zone= 3 , remove seed coat, sow @ 39ºF for germ. in 4 to 12 weeks
Acer platanoides , Norway maple ,zone= 3 , sow fresh seed only @ 39ºF for germ. in 3m
Acer pseudoplatanus , Sycamore maple ,zone= 4 , see A. griseum
Acer rubrum , Red Maple ,zone= 3 , sow at once upon ripening, or soak, then sow 9w @ 39ºF, move to 70ºF for germ.
Acer rufinerve , Snake Bark Maple ,zone= 6 , see A. pensylvanicum
Acer saccharinum , Silver Maple ,zone= 3 , sow fresh seed only @ 70ºF
Acer saccharum , Sugar Maple ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Acer spicatum , Mountain Maple ,zone= 2 , sow 3m @ 39ºF, move to 70ºF for germ.
Acer tataricum , Tatarian Maple ,zone= 4 , sow @ 39ºF for germ. in 3 to 6 months
Acer tegmentosum , Manchustripe Maple ,zone= 5 , see A. pensylvanicum
Acer triflorum , Three Flowered Maple ,zone= 6 , see A. griseum
Acer truncatum , Shantung Maple ,zone= 6 , see A. griseum
Actinidia arguta , Tara vine ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Actinidia kolomikta , Tara vine ,zone= 4 , sow 3m @ 70ºF, then 3m @ 39ºF, move to 70ºF for germ.
Aesculus carnea x , Red Horse-chestnut ,zone= 4 , sow fresh seed only - outdoors
Aesculus chinensis , Chinese Horse Chestnut ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Aesculus glabra , Ohio Buckeye ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for germ.
Aesculus hippocastanum , Horse Chestnut ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Aesculus parviflora , Bottlebrush buckeye ,zone= 4 , sow fresh seed only - outdoors
Aesculus pavia , Red buckeye ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for germ.
Aesculus sylvatica , Painted buckeye ,zone= 5 , sow fresh seed only - outdoors
Aesculus turbinata , Japanese Horse-chestnut ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Ailanthus altissima , Tree of heaven ,zone= 4 , sow @ 70ºF in light, if no germ. in 4w, move to 39ºF for 8w, recycle
Akebia quinata , Fiveleaf akebia ,zone= 4 , sow 8w @ 39ºF, move to 70ºF for germ.
Albizia julibrissin , Silk-tree ,zone= 6 , soak, puncture, soak again, sow @ 70ºF
Alnus cordata , Italian Alder ,zone= 6 , direct sow fresh seed outdoors
Alnus glutinosa , Alder ,zone= 3 , direct sow fresh seed outdoors
Alnus incana , White Alder ,zone= 2 , direct sow fresh seed outdoors
Alnus rugosa , Speckled Alder ,zone= 2 , direct sow fresh seed outdoors
Alnus serrulata , Hazel Alder ,zone= ?, direct sow fresh seed outdoors
Amelanchier alnifolia , Serviceberry ,zone= 2 , sow 3m @ 39ºF, move to 70ºF for germ.
Amelanchier arborea , Downy Serviceberry ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Amelanchier canadensis , Shadblow Serviceberry ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Amelanchier grandiflora , ,zone= 4 , wash seeds 3x daily 7d, sow 3m @ 39ºF, move to 70ºF for germ.
Amelanchier laevis , Allegheny serviceberry ,zone= 4 , sow 3m @ 70ºF, 3m @ 39ºF, 3m @ 70ºF, move to 39ºF for germ. in 10 to 12 wks
Amelanchier sanguinea , Utah Serviceberry ,zone= 3 , sow 3m @ 39ºF, 3m @ 70ºF, 3m @ 39ºF, move to 70ºF for germ. in 4 weeks
Amelanchier stolonifera , Running serviceberry ,zone= ?, sow fresh seed 3m @ 39ºF, move to 70ºF for germ. in 3 wks
Amorpha canescens , Leadplant ,zone= 2 , nick coat , sow @ 70ºF, if no germ., move to 39ºF for 4 wks, recycle
Amorpha fruticosa , Indigobush ,zone= 4 , nick coat , sow @ 70ºF, if no germ., move to 39ºF for 4 wks, recycle
Ampelopsis brevipedunculata , Porcelain ampelopsis ,zone= 4 , wash seeds 3x daily 7d, sow 3m @ 39ºF, move to 70ºF for germ.
Anisostichus capreolata , Crossvine ,zone= 6 , sow @ 70ºF
Aralia elata , Chinese Aralia ,zone= 4 , GA-3 soak, sow @ 70ºF for germ. in 3-9w
Aralia racemosa , American Spikenard ,zone= 4 , sow fresh seed outdoors in the fall
Aralia spinosa , Devils-walkingstick ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Arbutus menziesii , Madrone ,zone= 7 , sow 3m @ 39ºF, move to 70ºF for germ.
Arctostaphylos uva-ursi , Kinnikinick ,zone= 2 , scarify coat, sow 3m @ 70ºF, 3m @ 39ºF, move back to 70ºF for germ.
Aristolochia durior , Dutchman's pipe ,zone= 4 , direct sow outdoors in the fall
Aristolochia macrophylla , Pipevine ,zone= 6 , sow in light @ 70ºF for slow germ. 21-30d
Aronia melanocarpa , Black chokeberry ,zone= 4 , direct sow outdoors
Asimina triloba , Pawpaw ,zone= 5 , GA-3 soak, sow @ 70ºF for slow germ. 4-6w
Aucuba japonica , Japanese aucuba ,zone= 7 , sow @ 70ºF, slow to germ. slow to develop
Berberis candidula , Paleleaf barberry ,zone= 5 , wash seed 3x daily 7d, sow directly outdoors
Berberis julianae , Wintergreen Berberis ,zone= 5 , wash seed 3x daily 7d, sow directly outdoors
Berberis koreana , Korean barberry ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Berberis thunbergii , Japanese Berberis ,zone= 4 , sow directly outdoors
Betula albosinensis , Chinese Red Birch ,zone= 7 , sow 3m @ 39ºF, move to 70ºF for germ.
Betula alleghaniensis , Yellow Birch ,zone= 3 , see B. lenta
Betula davurica , Asian Black Birch ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Betula ermanii , Gold Birch ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Betula glandulosa , Bog birch ,zone= 1, sow 3m @ 39ºF, move to 70ºF in darkness
Betula grossa , Japanese Cherry Birch ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for germ.
Betula lenta , Cherry Birch ,zone= 3 , sow 2m @ 39ºF, move to 90ºF daytime and 60ºF night oscillating temps. for germ.
Betula maximowicziana , Monarch Birch ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Betula nigra , Black Birch ,zone= 4 , direct sow outdoors only
Betula occidentalis (B. fontinalis) , Water birch ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Betula papyrifera , Paper Birch ,zone= 2 , direct sow outdoors in the fall
Betula pendula , Silver Birch ,zone= 2 , sow 3m @ 39ºF, move to 70ºF for germ.
Betula platyphylla , Asian white birch ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for germ.
Betula populifolia , Grey Birch ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Betula pubescens , White Birch ,zone= 1 , sow @ 70ºF in light
Betula schmidtii , Schmidt birch ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for germ.
Betula tianshanica , ,zone= ? , sow 3m @ 39ºF, move to 70ºF in light
Broussonetia papyrifera , Paper mulberry ,zone= 6 , sow @ 70ºF
Buddleia davidii , Butterfly-bush ,zone= 5 , sow @ 70ºF
Buxus microphylla , Boxwood ,zone= 6 , sow @ 70ºF, if no germ. in 4 wks, move to 39ºF for 4 to 12 wks, recycle
Buxus sempervirens , Boxwood ,zone= 5, sow @ 70ºF, if no germ. in 4 wks, move to 39ºF for 4 to 12 wks, recycle
Callicarpa dichotoma , Purple beautyberry ,zone= 5 , sow @ 70ºF
Callicarpa japonica , Japanese beautyberry ,zone= 5 , sow @ 70ºF
Calluna vulgaris , Scotch heather ,zone= 4 , sow @ 70ºF on peat moss
Calocedrus deccurens , California incensecedar ,zone= 5 , sow 2m @ 39ºF, move to 70ºF for germ.
Calycanthus floridus , Carolina allspice ,zone= 5 , sow fresh seed directly outdoors in the fall
Camellia japonica , Japanese camellia ,zone= 7 , remove seed from capsules, sow @ 70ºF
Campsis radicans , Trumpet vine ,zone= 4 , sow 2m @ 39ºF, move to 70ºF for germ.
Caragana arborescens , Siberian Pea Tree ,zone= 2 , soak, sow 3w @ 39ºF, move to 70ºF for germ.
Carpinus betulus , Hornbeam ,zone= 4 , collect seed while still green, and wings are just starting to turn yellow, sow 4 wks @ 70ºF, 3m @ 39ºF, move to 70ºF for germ.
Carpinus caroliniana , American Hornbeam ,zone= 2 , see C. betulus
Carpinus cordata , ,zone= 5 , see C. betulus
Carpinus coreana , Korean Hornbeam ,zone= 7 , see C. betulus
Carpinus orientalis , Oriental Hornbeam ,zone= 5  , see C. betulus
Carpinus polyneura , ,zone= ?, see C. betulus
Carpinus schisiensis , ,zone= ?, see C. betulus
Carpinus schuschuensis x , ,zone= 6 , see C. betulus
Carpinus turczaninovii , ,zone= 7 , see C. betulus
Carpinus viminea , ,zone= 6 , see C. betulus
Carya cordiformis , Bitter-nut Hickory ,zone= 4 , soak 4d (change water often), sow 3-5m @ 39ºF, move to 70ºF for germ.
Carya glabra , Pig-nut Hickory ,zone= 4 , see C. cordiformis
Carya illinoiensis , Pecan ,zone= 5 , see C. cordiformis
Carya laciniosa , Shellbark Hickory ,zone= 5 , see C. cordiformis
Carya ovata , Shagbark Hickory ,zone= 4 , see C. cordiformis
Caryopteris incana , Bluebeard ,zone= 7 , sow fresh seed @ 70ºF for rapid germ. (seed stored more than 12 months is usually dead), will grow in zone 5, but hardiness is marginal depending upon depth of cold during winter.
Castanea mollissima , Chinese Chestnut ,zone= 4 , sow fresh seed 8-12w @ 39ºF, move to 70ºF for germ. (ephemeral seed must be stored moist if at all)
Catalpa speciosa , Western Catalpa ,zone= 5 , sow @ 70ºF
Ceanothus americanus , New Jersey tea ,zone= 4 , hot water soak, sow 3m @ 39ºF, move to 70ºF for germ.
Cedrela sinensis , Chinese cedrela ,zone= 5 , sow @ 70ºF
Cedrus atlantica , Atlas cedar ,zone= 6 , sow 2w @ 39ºF, move to 70ºF for germ.
Cedrus deodara , Deodar ,zone= 5 , sow 2w @ 39ºF, move to 70ºF for germ.
Cedrus libani , Cedar Of Lebanon ,zone= 6 , sow 2w @ 39ºF, move to 70ºF for germ.
Celastrus scandens , American bittersweet ,zone= 3 , store fresh seed 6m, then sow 3-6m @ 39ºF, move to 70ºF for germ.
Celtis occidentalis , Common hackberry ,zone= 2 , sow 3m @ 39ºF, move to 70ºF for germ.
Cephalanthus occidentalis , Buttonbush ,zone= 5 , sow @ 70ºF
Cephalotaxus fortunei , Chinese Plum Yew ,zone= 7 , sow 3m @ 39ºF, move to 70ºF for germ.
Cercidiphyllum japonicum , Katsura tree ,zone= 4 , sow @ 70ºF
Cercis canadensis , Eastern Redbud ,zone= 4 , scarify, sow 2m @ 39ºF, move to 70ºF for germ.
Cercis chinensis , Chinese Redbud ,zone= 6 , see C. canadensis
Cercocarpus ledifolius , Desert Mahogany ,zone= 6 , GA-3 soak (or try 5% hydrogen peroxide for 15 min.), sow 9m @ 39ºF, move to 70ºF for germ.
Chaenomeles speciosa , Flowering quince ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Chamaecyparis lawsoniana , Port Orford cedar ,zone= 5 , sow 3m @ 39ºF, move to 70ºF in light for germ.
Chamaecyparis nootkatensis , Golden Weeping Alaskan Cedar ,zone= 5 , sow 3m @ 39ºF, move to 70ºF in light for germ.
Chamaecyparis obtusa , Hinoki falsecypress ,zone= 4 . sow 3m @ 39ºF, move to 70ºF in light for germ.
Chamaecyparis thyoides , Atlantic white cedar ,zone= 3 , sow 3m @ 39ºF, move to 70ºF in light for germ.
Chimonanthus praecox , Fragrant wintersweet ,zone= 6 , collect seed in May or June when not fully dried, break the pericarp, then sow @ 70ºF
Chionanthus virginicus , White fringe tree ,zone= 3 , sow 3-5m @ 70ºF, then 1-2m @ 39ºF, move to 70ºF for germ.
Cladrastis lutea , Yellowwood ,zone= 4 , scarify, sow 3m @ 39ºF, move to 70ºF for germ.
Clematis x jackmanii , Jackman clematis ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Clethra alnifolia , Summersweet ,zone= 3 , sow fresh seed @ 70ºF
Cleyera japonica (Ternstroemia gymnanthera) , Japanese cleyera ,zone= 7 , direct sow outdoors in the fall
Colutea arborescens , Bladder-senna ,zone= 5 , scarify, sow @ 70ºF
Comptonia peregrina , Sweetfern ,zone= 2 , scarify, then GA-3 soak, sow @ 70ºF
Cornus alba , Tatarian dogwood ,zone= 2 , sow 3m @ 39ºF, move to 70ºF for germ.
Cornus alternifolia , Pagoda Dogwood ,zone= 3 , sow 2-5m @ 70ºF, 2-3m @ 39ºF, move to 70ºF for germ.
Cornus amomum , Silky dogwood ,zone= 5 , sow 4m @ 39ºF, move to 70ºF for germ.
Cornus canadensis , Bunchberry ,zone= 2 , scarify, sow 3m @ 70ºF, 3m @ 39ºF, move to 70ºF for germ.
Cornus florida , Flowering Dogwood ,zone= 5 , wash seeds, sow 5m @ 39ºF, move to 70ºF for germ.
Cornus kousa , Kousa Dogwood ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for germ.
Cornus mas , Cornelian Cherry ,zone= 5 , wash seeds, sow 4m @ 70ºF, then 3m @ 39ºF, move to 70ºF for germ.
Cornus nuttallii , Mountain Dogwood ,zone= 7 , sow 3m @ 39ºF, move to 70ºF for germ.
Cornus officinalis (shan zhu yu) , Japanese Cornel ,zone= 6 , see C. mas
Cornus racemosa , Gray dogwood ,zone= 4 , scarify, sow 4m @ 39ºF, move to 70ºF for germ.
Cornus sanguinea , Common Dogwood ,zone= 5 , sow 3-5m @ 70ºF, 3m @ 39ºF, move to 70ºF for germ.
Cornus sericea (C. stolonifera) , Red osier dogwood ,zone= 2 , see C. alba
Corylopsis glabrescens , Fragrant winterhazel ,zone= 5 , sow 3-5m @ 70ºF, 3m @ 39ºF, move to 70ºF for germ. (difficult)
Corylopsis pauciflora , Buttercup Witch Hazel ,zone= 6 , see C. glabrescens
Corylopsis spicata , Spike Witch Hazel ,zone= 6 , see C. glabrescens
Corylus americana , American Filbert ,zone= 4 , see C. colurna
Corylus avellana , European Hazel ,zone= 4 , see C. colurna
Corylus colurna , Turkish Hazel ,zone= 5 , sow 3-5m @ 70ºF, 3m @ 39ºF, move to 70ºF for germ.
Corylus cornuta , Beaked Filbert ,zone= 4 , sow 3m @ 70ºF, then 3m @ 39ºF, recycle for germ. in the third period
Cotinus coggyria , Smokebush ,zone= 5 , scarify, sow 3m @ 39ºF, move to 70ºF for germ.
Cotoneaster apiculatus , Cranberry cotoneaster ,zone= 4 , scarify, sow 3m @ 39ºF, move to 70ºF for germ.
Cotoneaster dammeri , Bearberry cotoneaster ,zone= 5 , sow 3m @ 39ºF, then 3m @ 70ºF, recycle for some germination in each of 5 periods
Cotoneaster divaricatus , Spreading cotoneaster ,zone= 4 , see C. apiculatus
Cotoneaster horizontalis , Rockspray ,zone= 4 , see C. apiculatus
Cotoneaster lucidus , Hedge cotoneaster ,zone= 3 , see C. apiculatus
Cotoneaster multiflorus , Many-flowered cotoneaster ,zone= 3 , see C. apiculatus
Cotoneaster salicifolius , Willowleaf cotoneaster ,zone= 6 , see C. apiculatus
Crataegus crus-galli , Cockspur Thorn ,zone= 5 , scarify, sow 4m @ 70ºF, 5m @ 39ºF, move to 70ºF for germ.
Crataegus laevigata , Hawthorn ,zone= 5 , see C. crus-galli
Crataegus mollis , Red Haw ,zone= 5 , see C. crus-galli
Crataegus monogyna , Hawthorn ,zone= 5 , see C. crus-galli
Crataegus monogyna , Oneseed hawthorn ,zone= 5 , wash seeds 3x daily 7d, sow 3m @ 70ºF, then 3m @ 39ºF, recycle
Crataegus phaenopyrum , Washington Thorn ,zone= 5 , see C. crus-galli
Crataegus punctata , Thicket hawthorn ,zone= 4 , see C. crus-galli
Crataegus succulenta , fleshy hawthorn ,zone= 4 , see C. crus-galli
Cryptomeria japonica , Japanese cedar ,zone= 5 , soak cold, store 8w moist cold, then sow 3m @ 70ºF, 3m @ 39ºF, move to 70ºF for germ.
Cupressus lusitanica , Cedar of Goa ,zone= 8 , sow 3m @ 39ºF, move to 70ºF for germ.
Cyrilla racemiflora , Leatherwood ,zone= 5 , sow @ 70ºF
Cytisus scoparius , Scotch broom ,zone= 5 , hot water soak, sow @ 68ºF night and 86ºF daytime temps.
Daphne cneorum , Rose daphne ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Davidia involucrata , Handkerchief Tree ,zone= 6 , sow in damp paper towel at 70ºF until seed coats start to open, move to 39ºF for 3 months, then sow outdoors. Alt = sow outdoors, wait two successive spring seasons.
Diospyros virginiana , Persimmon ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Dirca palustris , Leatherwood ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Elaeagnus angustifolia , Russian olive ,zone= 2 , sow 3m @ 39ºF, move to 70ºF for germ.
Enkianthus campanulatus , Redvein enkianthus ,zone= 4 , sow @ 70ºF
Eriobotrya japonica , Loquat ,zone= 8 , sow @ 70ºF
Eucommia ulmoides , Chinese Rubber Tree ,zone= 5 , sow 4wks @ 39ºF, move to 70ºF for germ.
Euonymus alatus db , Winged Spindle Tree ,zone= 3 , wash seeds 3x daily 7d, direct sow outdoors
Euonymus atropurpureus , Wahoo ,zone= 4 , wash fresh seed 3x daily 7d in detergent, sow 3m @ 70ºF, then 3m @ 39ºF, recycle for some germination in each of the next 5 periods.
Euonymus bungeanus , winterberry ,zone= 4 , wash seed 3x daily 7d, sow @ 39ºF for germ. in about 5 wks.
Euonymus europaeus , Spindle Tree ,zone= 3 , sow 3m @ 70ºF, 2 to 4 months @ 39ºF, move to 70ºF for germ.
Euonymus fortunei , Wintercreeper ,zone= 4 , remove arils, sow 3m @ 39ºF, move to 70ºF for germ.
Evodia daniellii , Korean evodia ,zone= 4 , direct sow outdoors
Exochorda racemosa , Pearlbush ,zone= 4 , sow 2m @ 39ºF in damp paper towels, the direct sow outdoors
Fagus grandifolia , American Beech ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Fagus sylvatica , European Beech ,zone= 4 , direct sow outdoors in the fall
Forsythia x intermedia , Border forsythia ,zone= 4 , sow 4wks @ 39ºF, move to 70ºF for germ.
Fothergilla gardenii , Dwarf fothergilla ,zone= 5 , sow 6m @ 70ºF night and 86ºF daytime temps, then 3m @ 39ºF, move to 70ºF for germ.
Fothergilla major , Large fothergilla ,zone= 4 , sow 12m @ 70ºF night and 86ºF daytime temps, then 3m @ 39ºF, move to 70ºF for germ.
Franklinia alatamaha , Franklinia ,zone= 5 , collect fresh seed before it has dried, sow @ 70ºF
Fraxinus americana , White Ash ,zone= 3 , sow 4 wks @ 70ºF, then 2m @ 39ºF, move to 70ºF for germ.
Fraxinus anomala , Single Leaf Ash ,zone= 6 , sow 3m @ 39ºF, move to 70ºF in darkness
Fraxinus excelsior , European Ash ,zone= 4 , see F. pennsylvanica
Fraxinus mandshurica , Manchurian Ash ,zone= 6 , sow 6m @ 70ºF, then 6m @ 39ºF, recycle
Fraxinus ornus , Flowering Ash ,zone= 6 , see F. pennsylvanica
Fraxinus pennsylvanica , Green Ash ,zone= 4 , sow 2m @ 70ºF, then 4m @ 39ºF, move to 70ºF for germ.
Fraxinus quadrangulata , Blue Ash ,zone= 4 , see F. pennsylvanica
Gaylussacia brachycera , Box huckleberry ,zone= 5 , sow 4wks @ 70ºF night and 86ºF daytime temps, then 30-50d @ 50ºF for germ.
Gelsemium sempervirens , Carolina yellow jessamine ,zone= 6 , sow @ 70ºF
Genista tinctoria , Woadwaxen ,zone= 4 , scarify and soak, sow @ 70ºF
Ginkgo biloba , Maidenhair tree ,zone= 3 , wash seed, sow 10w @ 70ºF in moist sand, then 3m @ 39ºF, move to 70ºF for germ.
Gleditsia triacanthos , Honey Locust ,zone= 3 , puncture seed coat, sow @ 70ºF
Gleditsia triacanthos v inermis , Thornless Honey Locust ,zone= 3 , scarify, sow @ 70ºF
Gymnocladus dioica , Kentucky Coffee Tree ,zone= 4 , scarify, sow @ 70ºF
Halesia carolina , Carolina silverbell ,zone= 5 , sow 3m @ 70ºF, then 3m @ 39ºF, recycle for germ. in 4th period
Halesia monticola , Mountain Silverbell ,zone= 5 , see H. carolina
Hamamelis japonica , Japanese Witch Hazel ,zone= 5 , sow 2m @ 70ºF, then 3m @ 39ºF, recycle
Hamamelis mollis , Chinese Witch Hazel ,zone= 6 , sow 3m @ 70ºF, then 3m @ 39ºF, recycle
Hamamelis vernalis , Vernal witchhazel ,zone= 4 , sow 2m @ 70ºF, then 3m @ 39ºF, recycle
Hamamelis virginiana , Virginian Witch Hazel ,zone= 5 , sow 2m @ 70ºF, then 3m @ 39ºF, recycle
Hamamelis x intermedia , ,zone= 5 , sow 2m @ 70ºF, then 3m @ 39ºF, recycle
Hedera helix , English ivy ,zone= 4 , wash seed, sow 3m @ 39ºF, move to 70ºF for germ.
Hibiscus syriacus , Rose-of-Sharon ,zone= 5 , sow @ 70ºF, or direct sow outdoors
Hippophae rhamnoides , Seabuckthorn ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Hovenia dulcis , Japanese raisintree ,zone= 5 , scarify, sow @ 70ºF
Hydrangea anomala subsp. petiolaris , Climbing hydrangea ,zone= 4 , sow 1m @ 39ºF, move to 70ºF for germ.
Hydrangea quercifolia , Oakleaf hydrangea ,zone= 5 , sow fresh seed only, @ 70ºF
Hypericum prolificum , Shrubby St. Johnswort ,zone= 3 , sow @ 70ºF
Iberis sempervirens , Candytuft ,zone= 4 , sow @ 70ºF
Ilex aquifolium , English Holly ,zone= 6 , see I. cornuta
Ilex cornuta , Chinese holly ,zone= 7 , wash seed 3x daily 14d, then sow @ 72ºF for slow germ. up to 18 months in bagged pots
Ilex crenata , Japanese Holly ,zone= 6 , see I. cornuta, except shorter time to germ.
Ilex opaca , American Holly ,zone= 5 , see I. cornuta
Ilex vomitoria , Yaupon ,zone= 7 , see I. cornuta, except shorter time to germ.
Illicium floridanum , Florida anise-tree ,zone= 8 , sow @ 70ºF
Itea virginica , Sweetspire ,zone= 5 , sow @ 70ºF
Juglans cinerea , Butternut ,zone= 4 , direct sow outdoors in the fall
Juglans nigra , Black Walnut ,zone= 4, direct sow outdoors in the fall
Juglans regia , English Walnut ,zone= 5 , direct sow outdoors in the fall
Juniperus chinensis , Chinese Juniper ,zone= 4 , gather ripe berries, wash seed 3x daily 7d, scarify, then sow 4m @ 39ºF, move to 70ºF for germ.
Juniperus communis , Juniper ,zone= 7 , see J. chinensis
Juniperus conferta , Shore juniper ,zone= 6 , see J. chinensis
Juniperus horizontalis , Creeping Juniper ,zone= 4 , see J. chinensis
Juniperus sabina , Savin juniper ,zone= 3 , see J. chinensis
Juniperus virginiana , Eastern Red Cedar ,zone= 4 , see J. chinensis
Kalmia angustifolia , Sheep Laurel ,zone= 2 , sow @ 70ºF on peat moss in light
Kalmia latifolia , Mountain-laurel ,zone= 4 , sow @ 70ºF on peat moss in light
Kalopanax pictus , Castor-aralia ,zone= 4 , scarify, sow 3m @ 70ºF, then 3m @ 39ºF, move to 70ºF for germ.
Koelreuteria paniculata , Varnish tree ,zone= 5 , scarify, sow 3m @ 39ºF, move to 70ºF for germ.
Kolkwitzia amabilis , Beautybush ,zone= 4 , sow @ 70ºF
Laburnum x watereri , Goldenchain tree ,zone= 5 , scarify, sow @ 70ºF
Lagerstroemia indica , Crapemyrtle ,zone= 7 , sow 2m @ 39ºF, move to 70ºF for germ.
Larix decidua , European Larch ,zone= 4 , sow 2m @ 39ºF, move to 70ºF for germ.
Larix gmelinii , Dahurian Larch ,zone= 1 , sow 2m @ 39ºF, move to 70ºF for germ.
Larix kaempferi , Japanese Larch ,zone= 4 , sow 2m @ 39ºF, move to 70ºF for germ.
Larix laricina , American Larch ,zone= 2 , sow 2m @ 39ºF, move to 70ºF for germ.
Larix occidentalis , Western Larch ,zone= 4 , sow 2m @ 39ºF, move to 70ºF for germ.
Larix russica , Siberian Larch ,zone= 1 , sow 2m @ 39ºF, move to 70ºF for germ.
Ledum groenlandicum , Labrador tea ,zone= 2 , sow @ 70ºF on peat moss
Leiophyllum buxifolium , Box sandmyrtle ,zone= 5 , sow @ 70ºF on peat moss
Lespedeza bicolor , Shrub bushclover ,zone= 4 , direct sow outdoors
Leucothoe fontanesiana , Fetterbush ,zone= 4 , sow @ 70ºF on peat moss
Ligustrum amurense , Amur privet ,zone= 3 , wash seed 3x daily 7d, direct sow outdoors
Ligustrum japonicum , Japanese privet ,zone= 7 , wash seed 3x daily 7d, direct sow outdoors
Ligustrum obtusifolium , Border privet ,zone= 3 , wash 3x daily 7d, store seed 6m, then sow @ 70ºF for germ. in 13 wks
Ligustrum sinense , Chinese privet ,zone= 7 , wash seed 3x daily 7d, direct sow outdoors
Lindera benzoin , Spice Bush ,zone= 5 , sow 4wks @ 77ºF, then 3m @ 39ºF, move to 70ºF for germ.
Lindera obtusiloba , Japanese spicebush ,zone= 6 , see L. benzoin
Liquidambar formosana , Formosan Gum ,zone= 7 , sow 1 to 3m @ 39ºF, move to 70ºF for germ.
Liquidambar styraciflua , Liquidambar ,zone= 5 , sow 1 to 3m @ 39ºF, move to 70ºF for germ.
Liriodendron tulipifera , Tulip Tree ,zone= 4 , sow 2 to 3m @ 39ºF, move to 70ºF for germ.
Liriope spicata , Lilyturf ,zone= 4 , wash seed 3x daily 7d, direct sow outdoors
Lonicera alpigena , Alps honeysuckle ,zone= 6 , sow 2m @ 39ºF, then 2m @ 70ºF, recycle until germ. occurs
Maackia amurensis , Amur maackia ,zone= 3 , hot water soak o/n, sow @ 70ºF
Maackia chinensis , Chinese maackia ,zone= 5 , hot water soak o/n, sow @ 70ºF
Maclura pomifera , Osage Orange ,zone= 5 , soak, sow 4 wks @ 39ºF, move to 70ºF for germ.
Magnolia acuminata and other species , Cucumber tree ,zone= 3 , remove seed coat, sow 3m @ 39ºF, then direct sow outdoors
Mahonia aquifolium , Oregon grapeholly ,zone= 4 , sow fresh seed 3m @ 39ºF, move to 70ºF for germ. (do not dry store seeds)
Malus hupehensis , Tea crabapple ,zone= 5 , sow 2m @ 39ºF, move to 70ºF for germ.
Melia azedarach , Chinaberry ,zone= 7 , sow @ 70ºF
Metasequoia glyptostroboides , Dawn Redwood ,zone= 5 , sow @ 70ºF
Mitchella repens , Partridgeberry ,zone= 3 , sow 2m @ 39ºF, move to 70ºF for germ.
Morus alba , White Mulberry ,zone= 4 , sow 2m @ 39ºF, move to 70ºF for germ.
Morus rubra , Red Mulberry ,zone= 5 , sow 2m @ 39ºF, move to 70ºF for germ.
Myrica pensylvanica , Northern bayberry ,zone= 2 , remove wax from seeds collected in October, sow 3m @ 39ºF, move to 70ºF for germ.
Nandina domestica , Nandina ,zone= 6 , direct sow outdoors for germ. in 2 years
Nemopanthus mucronatus , Mountain Holly ,zone= 5 , sow 3m @ 70ºF, then 3m @ 39ºF, recycle for germ. in 3 years
Nerium oleander , Oleander ,zone= 8 , sow @ 70ºF
Nothofagus dombeyi , Coigue ,zone= 8, GA-3 soak, sow 1w @ 39ºF, move to 70ºF for germ.
Nothofagus obliqua , Roble Beech ,zone= 8 , GA-3 soak, sow 3m @ 39ºF, move to 70ºF for germ.
Nothofagus procera , Rauli Beech ,zone= 7 , see N. dombeyi
Nothofagus pumilio , Lenga ,zone= 7 , see N. dombeyi
Nothofagus solanderi v cliffortoides , Mountain Beech ,zone= 8 , GA-3 soak, sow 3m @ 39ºF, move to 70ºF for germ.
Nyssa sinensis , Chinese Tupelo ,zone= 7 , direct sow outdoors
Nyssa sylvatica , Black Gum ,zone= 3 , sow 2m @ 39ºF, move to 70ºF for germ.
Ostrya virginiana , Ironwood ,zone= 4 , sow 6m @ 70ºF, then 6m @ 39ºF, recycle until germ. occurs
Oxydendrum arboreum , Sourwood ,zone= 5 , sow @ 70ºF on peat moss
Parrotia persica , Persian parrotia ,zone= 5 , sow 5m @ 68ºF night and 86ºF daytime temps, then 3m @ 39ºF, move to 70ºF for germ.
Parrotiopsis jacquemontia , ,zone= 5 , sow 6m @ 70ºF, then 6m @ 39ºF, recycle until germ. occurs
Parthenocissus quinquefolia , Virginia creeper ,zone= 3 , sow 4 wks @ 39ºF, move to 70ºF for germ. (invasive)
Paulownia tomentosa , Princess Tree ,zone= 5 , sow @ 68ºF night and 86ºF daytime temps. in light for germ. in 2 to 3 wks.
Phellodendron amurense , Amur Cork Tree ,zone= 3 , sow @ 70ºF
Philadelphus coronarius , Mock Orange ,zone= 4 , direct sow outdoors
Photinia villosa , Oriental photinia ,zone= 4 , sow 2m @ 39ºF, move to 70ºF for germ.
Physocarpus opulifolius , Ninebark ,zone= 2, sow 3m @ 39ºF, move to 70ºF for germ.
Physocarpus opulifolius , Eastern ninebark ,zone= 2 , sow @ 70ºF
Picea abies , Norway spruce ,zone= 2 , direct sow outdoors
Picea brewerana , Brewer's Weeping Spruce ,zone= 6 , direct sow outdoors
Picea engelmannii , Engelmann spruce ,zone= 2 , direct sow outdoors
Picea glauca , White Spruce ,zone= 2 , direct sow outdoors
Picea mariana , Black Spruce ,zone= 2 , direct sow outdoors
Picea omorika , Serbian Spruce ,zone= 5, direct sow outdoors
Picea orientalis , Oriental Spruce ,zone= 5, direct sow outdoors
Picea pungens , Colorado Spruce ,zone= 5 , direct sow outdoors
Picea pungens , Blue Colorado Spruce ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for low germ.
Picea rubens , Red Spruce ,zone= 3 , direct sow outdoors
Pieris japonica , Japanese pieris ,zone= 5 , sow @ 70ºF on peat moss
Pinus aristata , Bristle Cone Pine ,zone= 3 , sow @ 70ºF
Pinus banksiana , Jack Pine ,zone= 2 , sow 2w @ 39ºF, move to 70ºF for germ.
Pinus cembra , Swiss Stone Pine ,zone= 1 , direct sow outdoors, or sow 9m @ 39ºF, move to 70ºF for germ.
Pinus densiflora , Japanese Red Pine ,zone= 5 , sow @ 70ºF
Pinus echinata , Shortleaf pine ,zone= 6 , sow @ 70ºF
Pinus flexilis , Limber Pine ,zone= 3 , sow 2m @ 39ºF, move to 70ºF for germ,
Pinus koraiensis , Korean Pine ,zone= 3 , sow @ 70ºF
Pinus mugo , Swiss Mountain Pine ,zone= 3 , sow @ 70ºF
Pinus nigra ssp nigra , Austrian Pine ,zone= 5 , sow @ 70ºF
Pinus parviflora , Japanese White Pine ,zone= 5, sow 3m @ 39ºF, move to 70ºF for germ.
Pinus peuce , Macedonian Pine ,zone= 5 , sow 2m @ 39ºF, move to 70ºF for germ.
Pinus ponderosa , Ponderosa Pine ,zone= 4 , sow @ 70ºF
Pinus resinosa , Red Pine ,zone= 3 , sow @ 70ºF
Pinus rigida , Pitch Pine ,zone= 4 , sow @ 70ºF
Pinus sabiniana , Digger Pine ,zone= 8 , sow 2m @ 39ºF, move to 70ºF for germ.
Pinus strobus , Eastern White Pine ,zone= 3 , sow 2m @ 39ºF, move to 70ºF for germ.
Pinus sylvestris , Scots Pine ,zone= 2 , sow @ 70ºF
Pinus taeda , Loblolly Pine ,zone= 7 , sow @ 70ºF
Pinus thunbergii (thunbergiana) , Japanese Black Pine ,zone= 6 , sow @ 70ºF
Pistacia chinensis , Chinese pistache ,zone= 6 , Collect bluish color fruits only, wash seed 3x daily 7d, sow @ 39ºF in damp paper towels, check for radicle emergence in approx. in 50-60d, then sow outdoors.
Platanus occidentalis , American Plane ,zone= 4 , sow 2m @ 39ºF, move to 70ºF for germ.
Platanus orientalis , Oriental Plane ,zone= 7 , sow 2m @ 39ºF, move to 70ºF for germ.
Platanus x acerifolia , London planetree ,zone= 4 , sow 2m @ 39ºF, move to 70ºF for germ.
Poncirus trifoliata , Hardy-orange ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Populus alba , White Poplar ,zone= 3 , sow @ 70ºF, if you must
Populus tremuloides , American Aspen ,zone= 1 , sow @ 70ºF
Potentilla fruticosa , Bush cinquefoil ,zone= 2 , sow @ 70ºF
Prinsepia sinensis , Cherry prinsepia ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Prunus avium , Sweet Cherry ,zone= 3 , wash fresh seed 3x daily 7d, sow 3m @ 70ºF, then 3m @ 39ºF, recycle for germ. in 3rd and 5th periods, i.e., 70,39,(70), 39, (70)
Prunus caroliniana , Carolina cherrylaurel ,zone= 7 , direct sow outdoors in the fall
Prunus cerasifera , Cherry plum ,zone= 4 , wash seed 3x daily 7d, direct sow outdoors in the fall
Prunus laurocerasus , English laurel ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Pseudocydonia sinensis , Chinese quince ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for germ.
Pseudolarix x kaempferi , Golden-larch ,zone= 4 , sow 2m @ 39ºF, move to 70ºF for germ., low fertility
Pseudotsuga menziesii , Douglas Fir ,zone= 7 , sow @ 70ºF
Ptelea trifoliata , Hoptree ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Pterocarya fraxinifolia , Caucasian Wingnut ,zone= 5 , sow fresh seed @ 70ºF, direct sow dry seed outdoors
Pterostyrax hispida , Fragrant Epaulette Tree ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Punica granatum , Pomegranate ,zone= 7 , sow @ 70ºF
Pyracantha coccinea bs , Scarlet firethorn ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Pyrus calleryana 'bradford' , Bradford callery pear ,zone= 4 , sow 3m @ 33ºF, move to 70ºF for germ.
Quercus acutissima , Sawtooth oak ,zone= 5 , direct sow outdoors in the fall
Quercus alba , White Oak ,zone= 4 , direct sow outdoors in the fall
Quercus coccinea , Scarlet Oak ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Quercus imbricaria , Shingle oak ,zone= 4 , direct sow outdoors in the fall
Quercus macrocarpa , Bur Oak ,zone= 3 , direct sow outdoors in the fall
Quercus palustris , Pin oak ,zone= 4 , direct sow outdoors in the fall
Quercus phellos , Willow Oak ,zone= 6 , sow 3m @ 70ºF, then 3m @ 39ºF, recycle
Quercus robur , English Oak ,zone= 6 , sow @ 70ºF
Quercus rubra , Red Oak ,zone= 3 , sow 6w @ 39ºF, move to 70ºF for germ.
Quercus virginiana , Live Oak ,zone= 7 , direct sow outdoors in the fall
Raphiolepis umbellata , Indian hawthorn ,zone= 7 , wash seed 3x daily 7d, direct sow outdoors
Rhamnus cathartica , Common buckthorn ,zone= 2 , sow 3m @ 39ºF, move to 70ºF for germ.
Rhamnus frangula , Alder Buckthorn ,zone= 3 , sow 2m @ 39ºF, move to 70ºF for germ.
Rhododendron carolinianum , Carolina rhododendron ,zone= 5 , sow @ 70ºF on peat moss
Rhododendron catawbiense , Catawba rhododendron ,zone= 4 , sow @ 70ºF on peat moss
Rhododendron mucronulatum , Korean rhododendron ,zone= 4 , sow @ 70ºF on peat moss
Rhododendron schlippenbachii , Royal azalea ,zone= 4 , sow @ 70ºF on peat moss
Rhodotypos scandens , White Kerria ,zone= 5 , scarify, sow 2m @ 39ºF, move to 70ºF for germ.
Rhus typhina , Staghorn Sumach ,zone= 3 , scarify, sow @ 70ºF
Ribes alpinum , Alpine currant ,zone= 2 , direct sow outdoors
Robinia pseudoacacia , Black Locust ,zone= 3 , scarify, hot water soak, sow @ 70ºF
Rosa multiflora , Japanese rose ,zone= 5 , sow 4m @ 39ºF, move to 70ºF for germ.
Rosa rugosa , Saltspray rose ,zone= 2 , sow 4m @ 39ºF, move to 70ºF for germ.
Salix alba , White Willow ,zone= 2 , sow fresh seed @ 70ºF
Sambucus canadensis , American elder ,zone= 3 , sow 2m @ 68ºF, then 4m @ 39ºF in moist sand
Santolina chamaecyparissus , Lavender cotton ,zone= 6 , sow @ 70ºF
Sapindus drummondii , Western soapberry ,zone= 6 , wash seed 3x daily 7d, sow 50-60d @ 39ºF in damp paper towels until radicles emerge, then sow outdoors
Sassafras albidum , Sassafras ,zone= 4 , sow 4m @ 39ºF, move to 70ºF for germ.
Sciadopytis verticillata , Japanese Umbrella Pine ,zone= 6 ,sow 3m @ 65ºF in moist sand, then 3m @ 39ºF on peat moss
Sequoia sempervirens , Californian Redwood ,zone= 8 , direct sow outdoors in half shade after last frost in the spring.
Sequoiadendron giganteum , Giant Sequoia ,zone= 7 , sow @ 70ºF in darkness
Shepherdia canadensis , Russet buffaloberry ,zone= 2 , scarify, sow 3m @ 39ºF, move to 70ºF for germ.
Skimmia japonica , Japanese skimmia ,zone= 7 , wash seed 3x daily 7d, sow @ 70ºF
Sophora japonica , Japanese Pagoda Tree ,zone= 5 , scarify, sow @ 70ºF
Sorbaria sorbifolia , Ural false spirea ,zone= 2 , sow fresh seed @ 70ºF
Sorbus alnifolia , Korean Mountain Ash ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Sorbus americana , American Mountain Ash ,zone= 2 , sow 3m @ 39ºF, move to 70ºF for germ.
Sorbus aria , Whitebeam ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for germ.
Sorbus aucuparia , Mountain Ash ,zone= 2 , sow 3m @ 39ºF, move to 70ºF for germ.
Sorbus cashmeriana , ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for germ.
Spiraea x vanhouttei , Vanhoutte spirea ,zone= 3 , direct sow outdoors
Staphylea trifolia , Bladdernut ,zone= 5 , sow fresh seed only 3m @ 70ºF, then 3m @ 39ºF, move to 70ºF for germ.
Stephanandra incisa , Cutleaf stephanandra ,zone= 3 , sow fresh seed only 3m @ 70ºF, then 3m @ 39ºF, move to 70ºF for germ.
Stewartia ovata v grandiflora , Mountain Camellia ,zone= 5 , direct sow outdoors in the fall for germ. in the second following spring.
Stewartia pseudocamellia , Japanese Stewartia ,zone= 5 , direct sow outdoors for germ. in about 17m
Styrax japonicum , Japanese Snowbell ,zone= 5 , direct sow outdoors in the fall for germ. in the second following spring.
Styrax obassia , Fragrant Snowbell Tree ,zone= 6 , difficult, if at all
Symphoricarpos albus , Snowberry ,zone= 3 , scarify, sow 3m @ 70ºF, then 3m @ 39ºF, move to 70ºF for germ. Seed will not tolerate dry storage.
Symplocos paniculata , Sapphireberry ,zone= 4 , sow 3m @ 70ºF, then 3m @ 39ºF, move to 70ºF for germ.
Syringa reticulata , Japanese Tree Lilac ,zone= 5 , direct sow outdoors
Tamarix ramosissima , Five-stamen tamarix ,zone= 3 , sow @ 70ºF
Taxodium ascendens , Pond Cypress ,zone= 5 , soak 5 min. in ethyl alcohol, sow 3m @ 39ºF, move to 70ºF for germ.
Taxodium distichum , Bald cypress ,zone= 4 , soak 5 min. in ethyl alcohol, sow 3m @ 39ºF, move to 70ºF for germ.
Taxus cuspidata , Japanese Yew ,zone= 6 , direct sow outdoors
Thuja occidentalis , White Cedar ,zone= 2 , sow 2m @ 39ºF, move to 70ºF for germ.
Thuja orientalis , Oriental arborvitae ,zone= 5 , sow 2m @ 39ºF, move to 70ºF for germ.
Thuja plicata , Western Red Cedar ,zone= 6 , sow 2m @ 39ºF, move to 70ºF for germ.
Thujopsis dolobrata , False arborvitae ,zone= 5 , difficult, give them to nature
Tilia americana , American Basswood ,zone= 3 , difficult, give them to nature
Tilia cordata , Small Leaved Lime ,zone= 3 , direct sow outdoors for germ. in about 17m
Tilia tomentosa , Silver linden ,zone= 6 , difficult, give them to nature
Tsuga canadensis , Canadian Hemlock ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Tsuga caroliniana , Carolina Hemlock ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Tsuga chinensis , Chinese Hemlock ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Tsuga heterophylla , Western Hemlock ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Tsuga mertensiana , Mountain Hemlock ,zone= ?, sow 3m @ 39ºF, move to 70ºF for germ.
Ulmus alata , Winged Elm ,zone= 6 , sow 3m @ 39ºF, move to 70ºF for germ.
Ulmus americana , American Elm ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Ulmus glabra , Wych Elm ,zone= 5 , sow 3m @ 39ºF, move to 70ºF for germ.
Ulmus parvifolia , Chinese Elm ,zone= 5 , sow 2m @ 39ºF, move to 70ºF for germ.
Ulmus pumila , Siberian Elm ,zone= 4 , sow 3m @ 39ºF, move to 70ºF for germ.
Ulmus rubra , Slippery Elm ,zone= 3 , sow 3m @ 39ºF, move to 70ºF for germ.
Vaccinium corymbosum , Highbush blueberry ,zone= 3 , direct sow outdoors
Viburnum dentatum , Arrowwood viburnum ,zone= 2 , sow 6m to 17m @ 68ºF night and 86ºF daytime temps, then 2m @ 39ºF, recycle
Viburnum dilatatum , Linden viburnum ,zone= 5 , sow 5m @ 70ºF, then 3m @ 39ºF, recycle
Viburnum lantana , Wayfaring Tree ,zone= 3 , direct sow outdoors
Viburnum lentago , Sheepberry ,zone= 2 , sow 5m to 9m @ 68ºF night and 86ºF daytime temps, then 2m to 4m @ 39ºF, recycle
Viburnum opulus , European cranberrybush ,zone= 3 , sow 2m to 3m @ 68ºF night and 86ºF daytime temps, then 2m @ 39ºF, recycle
Viburnum x burkwoodii , Burkwood viburnum ,zone= 3 , wash seeds 3x daily 7d, sow @ 70ºF in moist paper towels until radicles emerge, then direct sow outdoors
Vitex negundo , Chastetree ,zone= 6 , direct sow outdoors
Weigela floribunda , Japanese wisteria ,zone= 4 , direct sow outdoors
Weigela florida , Weigela ,zone= 5 , direct sow outdoors
Xanthoceras sorbifolium , Yellowhorn ,zone= 6 , sow @ 70ºF
Zanthoxylum americanum , Northern Prickly Ash ,zone= 3 , direct sow outdoors in the fall
Zelkova serrata , Japanese zelkova ,zone= 5 , sow 2m @ 39ºF, move to 70ºF for germ.
Zenobia pulverulenta , Dusty zenobia ,zone= 5, sow @ 70ºF on peat moss



References for Seed Germination of woodies:

Norman C Deno, "Seed Germination Theory and Practice", 2nd Ed. 1993, and Supplements #1 and #2  (these books describe actual germination experience for each species tried, but are not restricted to woodies.)

Michael A Dirr, "Manual of Woody Landscape Plants", 1975 and numerous revisions. (the Doctor is in: descriptions of woody plants and their cultivars, along with best propagation advice.)

James A Young and Cheryl G Young, "Seeds of Woody Plants in North America", 1992 (marvelous book on seed germination of woodies; see Appendix B for germination characteristics by genera; these general rules are invaluable.)

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