Plants for USDA hardiness zone 4

Acer argutum (Acer argutum)

Aconite (Aconitum napellus)

Actinidia polygama (Actinidia polygama)

Acuminate cotoneaster (Cotoneaster acuminatus)

Adder's Tongue (Ophioglossum vulgatum)

Adonis amurensis (Adonis amurensis)

Adria Bellflower (Campanula portenschlagiana)

Adriatic Bellflower (Campanula garganica)

African Marigold (Tagetes erecta)

Ageratina aromatica (Ageratina aromatica)

Akebia (Akebia quinata)

Alchemilla alpina (Alchemilla alpina)

Alder (Alnus glutinosa)

Alfalfa (Medicago sativa)

Alkanet (Anchusa officinalis)

Alleghany Blackberry (Rubus allegheniensis)

Allegheny Barberry (Berberis canadensis)

Allegheny Plum (Prunus alleghaniensis)

Allium aflatunense (Allium aflatunense)

Allium cepa (Allium cepa)

Allium flavum (Allium flavum)

Allium ledebourianum (Allium ledebourianum)

Allium tuberosum (Allium tuberosum)

Allium ursinum (Allium ursinum)

Alnus incana (Alnus incana)

Alnus japonica (Alnus japonica)

Alnus maritima (Alnus maritima)

Alnus maximowiczii (Alnus maximowiczii)

Alnus serrulata (Alnus serrulata)

Alpenrose (Rhododendron ferrugineum)

Alpine Calamint (Acinos alpinus)

Alpine Currant (Ribes alpinum)

Alpine Dock (Rumex alpinus)

Alpine Forget-Me-Not (Myosotis alpestris)

Alpine French Honeysuckle (Hedysarum hedysaroides)

Alpine Rock Cress (Arabis alpina)

Alpine Spring Beauty (Claytonia megarhiza)

Alpine Strawberry (Fragaria vesca 'Semperflorens')

Alpine Sweetvetch (Hedysarum alpinum)

Alpine Wormwood (Artemisia umbelliformis)

Althaea cannabina (Althaea cannabina)

Althaea officinalis (Althaea officinalis)

Alum Root (Heuchera cylindrica)

Alum Root (Heuchera micrantha)

Amaranthus blitum (Amaranthus blitum)

Amaranthus caudatus (Amaranthus caudatus)

Amaranthus cruentus (Amaranthus cruentus)

Amaranthus hypochondriacus (Amaranthus hypochondriacus)

Amaranthus tricolor (Amaranthus tricolor)

Amelanchier spicata (Amelanchier spicata)

American Arbor-Vitae (Thuja occidentalis)

American Basswood (Tilia americana)

American Beech (Fagus grandifolia)

American Blackcurrant (Ribes americanum)

American Bladder Nut (Staphylea trifolia)

American Blue Vervain (Verbena hastata)

American Dewberry (Rubus canadensis)

American Elm (Ulmus americana)

American Germander (Teucrium canadense)

American Great Burnet (Sanguisorba canadensis)

American Hazel (Corylus americana)

American Holly (Ilex opaca)

American Honeysuckle (Lonicera canadensis)

American Ipecacuanna (Gillenia stipulata)

American Liquorice (Glycyrrhiza lepidota)

American Liverleaf (Hepatica acutiloba)

American Liverleaf (Hepatica americana)

American Plum (Prunus americana)

American Red Raspberry (Rubus strigosus)

American Spikenard (Aralia racemosa)

American Vetch (Vicia americana)

American Water Lotus (Nelumbo lutea)

American Wisteria (Wisteria frutescens)

American hornbeam (Carpinus caroliniana)

American persimmon (Diospyros virginiana)

Amur Cork Tree (Phellodendron amurense)

Amur Maackia (Maackia amurensis)

Amur Maple (Acer ginnala)

Amur River Grape (Vitis amurensis)

Amur daylily (Hemerocallis middendorffii)

Anchusa (Anchusa azurea)

Anethum graveolens (Anethum graveolens)

Angelica (Angelica archangelica)

Anise Hyssop (Agastache foeniculum)

Annual Fleabane (Erigeron annuus)

Annual Meadow Grass (Poa annua)

Anomalous peony (Paeonia anomala)

Apocynum venetum (Apocynum venetum)

Appalachian barren strawberry (Waldsteinia fragarioides)

Apple (Malus domestica)

Apple Rose (Rosa villosa)

Apricot (Prunus armeniaca)

Aquilegia coerulea (Aquilegia coerulea)

Aquilegia flabellata (Aquilegia flabellata)

Aquilegia flavescens (Aquilegia flavescens)

Aquilegia formosa (Aquilegia formosa)

Aquilegia pubescens (Aquilegia pubescens)

Aralia nudicaulis (Aralia nudicaulis)

Arctic Bramble (Rubus arcticus)

Arisaema serratum (Arisaema serratum)

Arrow Wood (Viburnum dentatum)

Artemisia scoparia (Artemisia scoparia)

Asarabacca (Asarum europaeum)

Asiatic Sweetleaf (Symplocos paniculata)

Asparagus (Asparagus officinalis)

Aspen Poplar (Populus tremula)

Astilbe (Astilbe thunbergii)

Aubretia (Aubrieta deltoidea)

Aurinia saxatilis (Aurinia saxatilis)

Austrian Pine (Pinus nigra)

Autumn olive (Elaeagnus umbellata)

Autumn olive (Elaeagnus parvifolia)

Avalanche Lily (Erythronium grandiflorum)

Azure bluet or Quaker ladies (Houstonia caerulea)

Baby's Breath (Gypsophila paniculata)

Bachelor's button (Kerria japonica)

Baikal Skullcap - Huang-Qin (Scutellaria baicalensis)

Balmony (Chelone glabra)

Balsam Fir (Abies balsamea)

Balsam Root (Balsamorhiza hookeri)

Baltic Rush (Juncus balticus)

Bao li (Quercus serrata)

Barberry (Berberis vulgaris)

Barley (Hordeum vulgare)

Barrenwort (Epimedium grandiflorum)

Basil Thyme (Acinos arvensis)

Beach Aster (Erigeron glaucus)

Beach Grass (Ammophila breviligulata)

Beach Pea (Lathyrus japonicus)

Beach Pine (Pinus contorta)

Beach Plum (Prunus maritima)

Beach Strawberry (Fragaria chiloensis)

Beach Wormwood (Artemisia stelleriana)

Beachhead Iris (Iris setosa)

Beak Willow (Salix bebbiana)

Beaked Hazel (Corylus cornuta)

Bearberry (Arctostaphylos uva-ursi)

Beaumont's Root (Veronicastrum virginicum)

Beech (Fagus sylvatica)

Beet (Beta vulgaris vulgaris)

Bellwort (Uvularia perfoliata)

Bellwort (Uvularia sessilifolia)

Berberis gagnepainii (Berberis gagnepainii)

Berberis verruculosa (Berberis verruculosa)

Bergamot (Monarda didyma)

Bermuda Blue-Eyed Grass (Sisyrinchium angustifolium)

Berry Bladder Fern (Cystopteris bulbifera)

Beth Root - Indian Balm (Trillium erectum)

Big Bluestem (Andropogon gerardii)

Bighead Clover (Trifolium macrocephalum)

Bigleaf Aster (Aster macrophyllus)

Bigroot Geranium (Geranium macrorrhizum)

Bilberry (Vaccinium myrtillus)

Bird's Foot Trefoil (Lotus corniculatus)

Bird's Foot Violet (Viola pedata)

Bitter-Root (Lewisia rediviva)

Bitternut (Carya cordiformis)

Bittersweet (Celastrus orbiculatus)

Bittersweet Bittersweet Nightshade (Solanum dulcamara)

Black Ash (Fraxinus nigra)

Black Cohosh (Cimicifuga racemosa (Actaea racemosa))

Black Eyed Susan (Rudbeckia hirta)

Black Hellebore (Helleborus niger)

Black Highbush Blueberry (Vaccinium fuscatum)

Black Huckleberry (Vaccinium ovalifolium)

Black Knapweed (Centaurea nigra)

Black Medick (Medicago lupulina)

Black Poplar (Populus nigra)

Black currant (Ribes nigrum)

Black hawthorn (Crataegus douglasii)

Black locust (Robinia pseudoacacia)

Black raspberry (Rubus occidentalis)

Black walnut (Juglans nigra)

Bladder Senna (Colutea arborescens)

Bladderwort (Utricularia vulgaris)

Bleeding Heart (Dicentra spectabilis)

Blue Ash (Fraxinus quadrangulata)

Blue Flag (Iris versicolor)

Blue Lupine (Lupinus nootkatensis)

Blue Sausage Fruit (Decaisnea fargesii)

Blue elderberry (Sambucus caerulea)

Blue false indigo (Baptisia australis)

Bluebeard (Clintonia borealis)

Bluebell (Hyacinthoides nonscripta)

Bog Heather (Erica tetralix)

Bog Myrtle (Myrica gale)

Bog Wintergreen (Pyrola asarifolia)

Border privet (Ligustrum obtusifolium)

Boston Ivy (Parthenocissus tricuspidata)

Bottlebrush buckeye (Aesculus parviflora)

Box Elder (Acer negundo)

Bracken (Pteridium aquilinum)

Brandywine Tomato (Solanum lycopersicum (Brandywine))

Breadroot (Psoralea esculenta)

Bridalwreath Spiraea (Spiraea prunifolia)

Bristle-Cone Pine (Pinus aristata)

Bristleleaf sedge (Carex eburnea)

Bristly Sarsaparilla (Aralia hispida)

Bristly locust (Robinia hispida)

Broad Bean (Vicia faba)

Broad-Leaved Thyme (Thymus pulegioides)

Broccoli (Brassica oleracea italica)

Brooklime (Veronica beccabunga)

Browntop Bent Grass (Agrostis capillaris)

Buffalo Berry (Shepherdia argentea)

Buffaloberry (Shepherdia argentea)

Bugle (Ajuga reptans)

Bugleweed (Lycopus virginicus)

Bugleweed (Lycopus uniflorus)

Bulbous Bittercress (Cardamine bulbosa)

Bull Mitchell grass (Astrebla squarrosa)

Bunge's hackberry (Celtis bungeana)

Burnet Rose (Rosa pimpinellifolia)

Burnet Saxifrage (Pimpinella saxifraga)

Burr Oak (Quercus macrocarpa)

Bush Cherry (Prunus humilis)

Bush Groundsel (Baccharis halimifolia)

Bush Honeysuckle (Diervilla lonicera)

Butterbur (Petasites hybridus)

Butterbur (Petasites albus)

Butterfly Mariposa Lily (Calochortus venustus)

Butterfly Weed (Asclepias tuberosa)

Butternut - White Walnut (Juglans cinerea)

Butterwort (Pinguicula vulgaris)

Button Bush (Cephalanthus occidentalis)

Button Eryngo (Eryngium yuccifolium)

Buttonwood (Platanus occidentalis)

California False Hellebore (Veratrum californicum)

California Hedgenettle (Stachys bullata)

California Wild Rose (Rosa californica)

Californian Brome (Bromus carinatus)

Californian Red Fir (Abies magnifica)

Calochortus barbatus (Calochortus barbatus)

Canada Beadruby (Maianthemum canadense)

Canada Moonseed (Menispermum canadense)

Canada Violet (Viola canadensis)

Canadian Aspen (Populus grandidentata)

Canadian Garlic (Allium canadense)

Canadian Hemlock (Tsuga canadensis)

Canadian Wild Rye (Elymus canadensis)