Common Name | Latin Name | Type | Rating |
---|
African Lily | Agapanthus sp. | Perennials | B |
Ageratum  | Ageratum houstonianum | Annuals | A |
Allegheny Serviceberry  | Amelanchier laevis | Trees | B |
Allegheny Spurge | Pachysandra procumbens | Groundcovers | A |
Alternate-Leaved Dogwood | Cornus alternifolia | Trees | C |
American Arborvitae | Thuja occidentalis | Trees | D |
American Bittersweet | Celastrus scandens | Vines | B |
American Holly | Ilex opaca | Trees | A |
Angel's Trumpet | Brugmansia sp. (Datura) | Annuals | A |
Anise | Pimpinalla anisum | Annuals | A |
Anise Hyssop  | Agastache sp. | Perennials | A |
Annual Vinca  | Catharanthus rosea | Annuals | A |
Anthony Waterer Spirea | Spiraea x bumalda | Shrubs | B |
Apples | Malus sp. | Trees | C |
Armstrong Juniper | Juniperus chinensis 'Armstrongii' | Shrubs | B |
Arrowwood Viburnum | Viburnum dentatum | Shrubs | A |
Asparagus | Asparagus officinalis | Perennials | B |
Aster | Aster sp. | Perennials | B |
Astilbe  | Astilbe sp. | Perennials | B |
Atlantic White Cedar | Chamaecyparis thyoides | Trees | C |
Atlas Cedar | Cedrus atlantica | Trees | C |
Austrian Pine | Pinus nigra | Trees | B |
Autumn Crocus  | Colchicum sp. | Bulbs | A |
Autumn Olive | Elaeagnus umbellatus | Shrubs | B |
Baby's Breath | Gypsophila sp. | Perennials | B |
Bachelor's Buttons | Centaurea cyanus | Annuals | B |
Bald Cypress | Taxodium distichum | Trees | C |
Balloon Flower | Platycodon grandiflorus | Perennials | C |
Balsam Fir | Abies balsamea | Trees | C |
Balsam, Touch-Me-Not | Impatiens balsamina | Annuals | C |
Bamboo | Bambusa sp. | Ornamental Grasses | B |
Barberry  | Berberis sp. | Shrubs | A |
Barrenwort  | Epimedium sp. | Groundcovers | A |
Basil | Ocimum basilicum | Annuals | B |
Basket of Gold | Aurinia saxatilis | Perennials | A |
Basswood | Tilia americana | Trees | C |
Bayberry | Myrica pensylvanica | Shrubs | A |
Bearberry | Arctostaphylos uva-ursi | Groundcovers | A |
Bearberry Cotoneaster | Cotoneaster dammeri | Shrubs | B |
Beautyberry  | Callicarpa sp. | Shrubs | B |
Beautybush | Kolkwitzia amabilis | Shrubs | B |
Beebalm | Monarda didyma | Perennials | B |
Bellflower | Campanula glomerata | Perennials | C |
Big Bluestem  | Andropogon sp. | Ornamental Grasses | A |
Bigleaf Goldenray  | Ligularia dentata | Perennials | A |
Bigleaf Hydrangea | Hydrangea macrophylla | Shrubs | C |
Bishop's Weed  | Aegopodium podagaria | Groundcovers | A |
Black Locust | Robinia pseudoacia | Trees | C |
Black-Eyed Susan | Rudbeckia sp. | Perennials | B |
Blackhaw Viburnum | Viburnum prunifolium | Shrubs | B |
Blanket Flower  | Gaillardia sp. | Perennials | C |
Blazing Star  | Liatris sp. | Perennials | B |
Bleeding Heart  | Dicentra spectabilis | Perennials | A |
Bloodtwig Dogwood | Cornus sanguinea | Shrubs | C |
Blue Fescue  | Festuca glauca | Ornamental Grasses | A |
Blue Holly | Ilex x meserveae | Shrubs | C |
Blue Mist Shrub  | Caryopteris clandonensis | Shrubs | A |
Blue Oat Grass | Helictotrichon sempervirens | Ornamental Grasses | A |
Blue Star Juniper | Juniperus squamata 'Blue Star' | Shrubs | B |
Bluebell | Endymion sp. | Bulbs | A |
Blueberry Elder, Sweet Elder | Sambucus canadensis | Shrubs | B |
Bog Rosemary | Andromeda polifolia | Shrubs | B |
Borage  | Borage officinalis | Annuals | B |
Bottlebrush Buckeye  | Aesculus parviflora | Trees | A |
Bottlebrush Grass | Hystrix patula | Ornamental Grasses | B |
Brambles | Rubus sp. | Shrubs | B |
Bridalwreath Spirea | Spiraea prunifolia | Shrubs | B |
Broom | Cytisus sp. | Shrubs | A |
Buckthorn | Rhammus sp. | Shrubs | B |
Bugleweed  | Ajuga reptans | Groundcovers | A |
Bugloss | Anchusa sp. | Perennials | B |
Bush Cinquefoil | Potentilla fruticosa | Shrubs | A |
Butter & Eggs | Linaria vulgaris | Perennials | A |
Buttercup | Ranunculus sp. | Perennials | A |
Butterfly Bush  | Buddleia sp. | Shrubs | A |
Butterfly Weed | Asclepias tuberosa | Perennials | B |
Cactus | Cactaceae sp. | Perennials | A |
Caladium | Caladium sp. | Bulbs | C |
California Poppy  | Eschscholzia californica | Annuals | B |
California Sweetshrub | Calycanthus occidentalis | Shrubs | B |
Calla Lily | Zantedeschia sp. | Bulbs | B |
Callery Pear | Pyrus calleryana | Trees | C |
Camassia | Camassia leichtlini | Bulbs | B |
Candy Lily | Pardancanda x norrisii | Perennials | D |
Candytuft | Iberis sempervirens | Perennials | B |
Candytuft | Iberis umbellata | Annuals | B |
Canna Lily  | Canna sp. | Bulbs | B |
Canterbury Bells | Campanula medium | Biennials | C |
Cardinal Flower  | Lobelia sp. | Perennials | B |
Carnation, Pinks | Dianthus sp. | Perennials | B |
Carolina Hemlock | Tsuga caroliniana | Trees | C |
Carolina Rhododendron | Rhododendron carolinianum | Shrubs | C |
Carolina Silverbell | Halesia carolina | Shrubs | B |
Catawba Rhododendron | Rhododendron catawbiense | Shrubs | C |
Catmint  | Nepeta sp. | Perennials | A |
Checkermallow | Sidalcia malviflora | Perennials | C |
Cherries (1) | Prunus sp. | Trees | D |
Cherry Laurel | Prunus laurocerasus | Shrubs | B |
Chestnut Oak | Quercus prinus | Trees | C |
Chinese Fringe Tree | Chionanthus retusus | Trees | B |
Chinese Holly | Ilex cornuta | Shrubs | B |
Chinese Juniper (1) | Juniperus chinensis cv. | Shrubs | B |
Chinese Lilac | Syringa x chinesis | Shrubs | C |
Chinese Paper Birch | Betula albo-sinensis | Trees | B |
Christmas Fern  | Polystichum arcostichoides | Ferns | A |
Cinnamon Fern | Osmunda cinnamomea | Ferns | A |
Clematis | Clematis sp. | Vines | C |
Climbing Hydrangea | Hydrangea anomala petiolaris | Vines | C |
Clump Bamboo | Fargesia sp. | Ornamental Grasses | A |
Coast Leucothoe | Leucothoe axillaris | Shrubs | B |
Cock's Comb | Celosia sp. | Annuals | B |
Coleus  | Coleus sp. | Annuals | C |
Colorado Blue Spruce | Picea pungens | Trees | B |
Columbine  | Aquilegia sp. | Perennials | B |
Comfrey | Symphytum officinale | Perennials | C |
Common Boxwood  | Buxus sempervirens | Shrubs | A |
Common Flowering Quince | Chaenomeles speciosa | Trees | B |
Common Foxglove  | Digitalis purpurea | Biennials | A |
Common Horsechestnut | Aesculus hippocastanum | Trees | C |
Common Lilac | Syringa vulgaris | Shrubs | B |
Common Pear | Pyrus communis | Trees | C |
Common Sassafras | Sassafras albidurn | Trees | B |
Common Sweetshrub | Calycanthus floridus | Shrubs | B |
Common Tansy | Tanacetum vulgare | Perennials | A |
Common Witchhazel | Hamamelis virginiana | Shrubs | B |
Common Yarrow  | Achillea millefolium | Perennials | B |
Coralbells  | Heuchera sp. | Perennials | B |
Coralberry | Symphoricarpos x chenaultii | Shrubs | B |
Corkscrew Willow | Salix matsudana tortuosa | Trees | B |
Cornelian Cherry | Cornus mas | Trees | C |
Corydalis | Corydalis sp. | Perennials | A |
Cosmos | Cosmos sp. | Annuals | C |
Cranberry Bush  | Viburnum opulus | Shrubs | B |
Cranberry Cotoneaster | Cotoneaster apiculatus | Shrubs | B |
Crape Myrtle  | Lagerstroemia indica | Shrubs | B |
Creeping Juniper (1) | Juniperus horizontalis cv. | Shrubs | B |
Creeping Wintergreen | Gaultheria procumbens | Groundcovers | B |
Crocosmia  | Croscosmia sp. | Perennials | B |
Crocus | Crocus sp. | Bulbs | B |
Crown Imperial, Fritilia | Fritilaria imperialis | Bulbs | A |
Currant | Ribes sp. | Shrubs | B |
Cyclamen | Cyclamen sp. | Perennials | B |
Daffodil  | Narcissus sp. | Bulbs | A |
Dahlia | Dahlia sp. | Annuals | C |
Dame's Rocket | Hesperis matronalis | Perennials | A |
Daphne  | Daphne sp. | Shrubs | A |
Dawn Redwood | Metasequoia glyptostroboides | Trees | B |
Daylily | Hemerocallis sp. | Perennials | C |
Deciduous Azaleas (1) | Rhododendron sp. | Shrubs | C |
Delphinium | Delphinium sp. | Perennials | B |
Deutzia  | Deutzia sp. | Shrubs | B |
Devil's Walking Stick | Aralia spinosa | Shrubs | A |
Dill | Anethumus graveolens | Annuals | B |
Doublefile Viburnum  | Viburnum plicatum tomentosurn | Shrubs | B |
Douglas Fir | Pseudotsuga menziesii | Trees | B |
Downy Serviceberry | Amelanchier arborea | Trees | B |
Dragon Lady, San Jose Holly | Ilex x aquipernyi | Trees | B |
Drooping Leucothoe  | Leucothoe fontanesiana | Shrubs | A |
Drooping Sedge | Carex pendula | Ornamental Grasses | B |
Dusty Miller | Centaurea cineraria | Annuals | A |
Dwarf Alberta Spruce  | Picea glauca 'Conica' | Trees | A |
Dwarf Balsam Fir | Abies balsamea | Shrubs | B |
Dwarf Mondo Grass | Ophiopogon japonicus | Ornamental Grasses | B |
Eastern Hemlock | Tsuga canadensis | Trees | C |
Eastern Red Cedar  | Juniperus virginiana | Trees | B |
Eastern Redbud  | Cercis canadensis | Trees | C |
Eastern White Pine | Pinus strobus | Trees | B |
Elephant Ear  | Colocasia esculenta | Bulbs | B |
English Daisy | Bellis perennis | Perennials | C |
English Hawthorn | Crataegus laevigata | Trees | B |
English Holly  | Ilex aquifolium | Shrubs | B |
English Ivy  | Hedera helix | Vines | C |
English Ivy  | Hedera helix | Groundcovers | C |
European Ash | Fraxinus excelsior | Trees | B |
European Beech | Fagus sylvatica | Trees | B |
European Ginger  | Asarum europaeum | Perennials | A |
European Larch | Larix decidua | Trees | C |
European Mountain Ash | Sorbus aucuparia | Trees | D |
European White Birch | Betula pendula | Trees | B |
Evergreen Azaleas (1) | Rhododendron sp. | Shrubs | D |
Fall Mums | Chrysanthemum | Perennials | C |
False Camomile | Matricaria sp. | Annuals | A |
False Indigo  | Baptisia australis | Perennials | A |
Feather Reed Grass  | Calamagrostis sp. | Ornamental Grasses | A |
Feverfew  | Chrysanthemum parthenium | Perennials | B |
Firethorn | Pyracantha coccinea | Shrubs | B |
Fleabane | Erigeron sp. | Perennials | C |
Flowering Dogwood  | Cornus florida | Trees | C |
Flowering Tobacco | Nicotiana sp. | Annuals | A |
Foam Flower  | Tiarella cordifolia | Perennials | B |
Forget-Me-Not | Myosotis alpestris | Biennials | B |
Forget-Me-Not | Myosotis sp. | Perennials | A |
Forget-Me-Not | Myosotis sylvatica | Annuals | A |
Forsythia | Forsythia x intermedia | Shrubs | B |
Fothergillia | Fothergila sp. | Shrubs | B |
Fountain Grass  | Pennisetum alopecuroides | Ornamental Grasses | A |
Fragrant Sumac  | Rhus aromatica | Shrubs | A |
Fragrant Winterhazel | Corylopsis glabrescens | Shrubs | C |
Fraser Fir | Abies fraseri | Trees | C |
French Marigold  | Tagetes patula | Annuals | B |
Fringed Bleeding Heart | Dicentra eximia | Perennials | A |
Garden Lily | Lilium sp. | Bulbs | C |
Garden Petunia  | Petunia sp. | Annuals | C |
Garden Sage  | Salvia officinalis | Perennials | A |
Gas Plant  | Dictamus alba | Perennials | B |
Geranium  | Pelargonium sp. | Annuals | C |
Gerbera Daisy | Gerbera jamesonii | Annuals | C |
Germander  | Teucrium chamaedrys | Perennials | A |
Geum, Avens | Geum sp. | Perennials | C |
Giant Japanese Silver Grass | Miscanthus floridulis | Ornamental Grasses | A |
Giant Reed  | Arundo donax | Ornamental Grasses | A |
Gladiolus | Gladiolus sp. | Bulbs | B |
Globeflower | Trollius sp. | Perennials | C |
Glory Lily | Gloriosa superba | Bulbs | B |
Glossy Abelia | Abelia sp. | Shrubs | B |
Goat's Beard | Aruncus sp. | Perennials | C |
Golden Bamboo | Phyllostachys aurea | Ornamental Grasses | A |
Goldenrain Tree  | Koelreuteria paniculata | Trees | B |
Goldenrod  | Solidago sp. | Perennials | B |
Goldflame Honeysuckle  | Lonicera x heckrottii | Vines | C |
Goldust Plant  | Aucuba japonica | Shrubs | B |
Gooseneck Loosestrife | Lysimachia clethroides | Perennials | C |
Grape Hyacinth | Muscari sp. | Bulbs | B |
Greek Jerusalem Sage | Phlomis sp. | Perennials | A |
Green Ash | Fraximus pennsylvanica | Trees | B |
Greenspire Littleleaf Linden | Tilia cordata 'Greenspire' | Trees | C |
Hakonechloa  | Hakonechloa macra | Ornamental Grasses | A |
Hard Rush | Juncus effusus | Ornamental Grasses | A |
Hardy Begonia  | Begonia grandis | Perennials | C |
Hardy Geranium | Geranium clarkei | Perennials | C |
Hardy Geranium | Geranium endressii | Perennials | D |
Hardy Geranium | Geranium macrorrhizum | Perennials | B |
Hardy Geranium | Geranium sanguineum | Perennials | C |
Hardy Geranium | Geranium x cantabrigiense | Perennials | C |
Harlequin Glorybower | Clerodendrum fargesii | Shrubs | B |
Hayscented Fern  | Dennstaedtia punctilobula | Ferns | A |
Hazelnut | Corylus sp. | Shrubs | B |
Heartleaf Bergenia  | Bergenia sp. | Perennials | B |
Heath | Erica sp. | Shrubs | A |
Heather | Calliuna sp. | Shrubs | A |
Heavenly Bamboo  | Nandina sp. | Shrubs | C |
Heliotrope | Heliotropium arborescens | Annuals | A |
Hens and Chickens  | Sempervivum sp. | Perennials | B |
Highbush Blueberry | Vaccinum corymbosum | Shrubs | C |
Himalayan Birch | Betula jacquemontii | Trees | B |
Hinoki Cypress | Chamaecyparis obtusa | Trees | C |
Holly Fern | Cyrtomium falcatum | Ferns | A |
Holly Osmanthus | Osmanthus heterophyllus | Shrubs | B |
Hollyhock | Alcea sp. | Perennials | C |
Honey Locust  | Gleditsia triacanthos | Trees | B |
Horehound | Marrubium vulgare | Perennials | A |
Horseradish | Armoracia rusticana | Perennials | A |
Hosta  | Hosta sp. | Perennials | D |
Hyacinth | Hyacinthus sp. | Bulbs | B |
Hybrid Tea Rose | Rosa x hybrid | Shrubs | C |
Hyssop | Hyssopus officinalis | Perennials | A |
Impatiens  | Impatiens walleriana | Annuals | C |
Indian Grass | Sorghastrum nutans | Ornamental Grasses | A |
Inkberry | Ilex glabra | Shrubs | B |
Iris (2) | Iris sp. | Perennials | A |
Jack-in-the-pulpit | Arisaema triphylum | Perennials | A |
Jacob's Ladder | Polemonium caeruleum | Perennials | B |
Japanese Anemone | Anemone x hybrida | Perennials | B |
Japanese Black Pine | Pinus thunbergiana | Trees | A |
Japanese Blood Grass  | Imperata cylindrica | Ornamental Grasses | A |
Japanese Cedar | Cryptomeria japonica | Trees | B |
Japanese Euonymus | Euonymus japonica | Shrubs | C |
Japanese Falsecypress  | Chamaecyparis pisifera | Trees | B |
Japanese Flowering Cherry | Prunus serrulata | Trees | B |
Japanese Flowering Quince | Chaenomeles japonica | Shrubs | B |
Japanese Garden Juniper | Juniperus procumbens 'Nana' | Shrubs | B |
Japanese Holly  | Ilex crenata | Shrubs | C |
Japanese Kerria | Kerria japonica | Shrubs | B |
Japanese Maple  | Acer palmatum | Trees | B |
Japanese Painted Fern  | Athyrium goeringianum (nipponicum) | Ferns | A |
Japanese Pieris, Andromeda  | Pieris japonica | Shrubs | A |
Japanese Plum Yew  | Cephalotaxus harringtonia | Shrubs | A |
Japanese Red Pine | Pinus densiflora | Trees | B |
Japanese Sedge  | Carex sp. | Ornamental Grasses | A |
Japanese Silver Grass  | Miscanthus sinensis | Ornamental Grasses | A |
Japanese Skimmia | Skimmia japonica | Shrubs | A |
Japanese Spirea  | Spiraea japonica | Shrubs | B |
Japanese Sweet Flag | Acorus sp. | Ornamental Grasses | A |
Japanese Tree Lilac | Syringa reticulata | Shrubs | B |
John T. Morris Holly | Ilex x 'John T. Morris' | Shrubs | A |
Judd Viburnum | Viburnum x juddii | Shrubs | B |
Katsura Tree | Cercidiphyllum japonicum | Trees | A |
Koreanspice Viburnum | Viburnum carlesii | Shrubs | B |
Kousa Dogwood  | Cornus kousa | Trees | B |
Ladys' Mantle  | Alchemilla sp. | Perennials | B |
Lamb's Ear  | Stachys byzantina | Perennials | A |
Lance Coreopsis  | Coreopsis lanceolata | Perennials | B |
Lantana  | Lantana sp. | Annuals | B |
Large Blue June Grass | Koeleria glauca | Ornamental Grasses | A |
Large Periwinkle | Vinca major | Groundcovers | B |
Larkspur | Consolida ambigua | Annuals | A |
Late Lilac | Syringa villosa | Shrubs | C |
Lavendar | Lavandula sp. | Perennials | A |
Lavender-Cotton | Santolina chamaecyparissus | Perennials | A |
Leatherleaf Mahonia  | Mahonia bealei | Shrubs | A |
Leatherleaf Viburnum | Viburnum rhytidophyllum | Shrubs | B |
Lemon Balm | Melissa officinalis | Perennials | A |
Lenten or Christmas Rose  | Helleborus sp. | Perennials | A |
Leyland Cypress | Cupressocyparis leyandii | Trees | C |
Lily of the Valley  | Convallaria majalis | Groundcovers | A |
Lilyturf | Liriope sp. | Groundcovers | B |
Little Bluestem | Schizachyrium scoparium | Ornamental Grasses | A |
Lobelia | Lobelia sp. | Annuals | B |
Lungwort  | Pulmonaria sp. | Perennials | A |
Lupine | Lupinus sp. | Perennials | B |
Lydia Morris Holly | Ilex x 'Lydia Morris' | Shrubs | A |
Lyme Grass  | Leymus arenarius glaucous | Ornamental Grasses | A |
Maltese Cross  | Lychnis chalcedonica | Perennials | B |
Marjoram | Majorana | Perennials | A |
May Apple | Podophyllum | Perennials | A |
Meadow Rue | Thalictrum sp. | Perennials | A |
Meadow Sage | Salvia nemorosa | Perennials | B |
Meadowsweet | Filipendula sp. | Perennials | C |
Mimosa  | Albizia julibrissin | Trees | A |
Mint | Mentha sp. | Perennials | A |
Mist Flower | Eupatorium coelestinurn | Perennials | B |
Money Plant  | Lunaria annua | Biennials | B |
Monkshood | Aconitum sp. | Perennials | A |
Moonglow Juniper | Juniperus scopulorum 'Moonglow' | Shrubs | A |
Morning Glory | Ipomea sp. | Annuals | C |
Mountain Bluet | Centaurea montana | Perennials | C |
Mountain Juniper (1) | Juniperus scopulorum cv. | Shrubs | B |
Mountain Laurel  | Kalmia latifolia | Shrubs | C |
Mountain Pieris | Pieris floribunda | Shrubs | A |
Mugo Pine  | Pinus mugo | Shrubs | B |
Mullein | Verbascum sp. | Perennials | B |
Multiflora Rose | Rosa multiflora | Shrubs | C |
Nasturtium | Tropaeolum majus | Annuals | B |
Nellie Stevens Holly | Ilex x 'Nellie R. Stevens' | Trees | C |
New York Fern  | Thelyptens noveboracensis | Ferns | A |
Northern Red Oak | Quercus rubra | Trees | C |
Northern Sea Oats  | Chasmanthium latifolium | Ornamental Grasses | A |
Norway Maple | Acer platanoides | Trees | C |
Norway Spruce | Picea abies | Trees | B |
Oakleaf Hydrangea  | Hydrangea quercifolia | Shrubs | C |
Obedient Plant | Physostegia sp. | Perennials | B |
Oregano | Oreganum sp. | Perennials | A |
Oregon Grape Holly  | Mahonia aquifolium | Shrubs | A |
Oriental Fountain Grass  | Pennisetum orientale | Ornamental Grasses | A |
Oriental Poppy | Papaver orientale | Perennials | B |
Ornamental Onion  | Allium sp. | Perennials | A |
Ornamental Onion  | Allium sp. | Bulbs | A |
Ostrich Fern | Matteuccia struthiopteris | Ferns | A |
Pachysandra  | Pachysandra terminalis | Groundcovers | A |
Pampus Grass | Cortaderia selloana | Ornamental Grasses | A |
Panicle Hydrangea | Hydrangea paniculata | Shrubs | C |
Panicled Dogwood | Cornus racemosa | Shrubs | C |
Pansy | Viola sp. | Annuals | C |
Paper Birch | Betula papyrifera | Trees | A |
Paperbark Maple  | Acer griseurn | Trees | B |
Parsley | Petroselinum crispum | Annuals | B |
Patrinia | Patrinia scabiosifolia | Perennials | B |
Pawpaw  | Asimina triloba | Trees | A |
Penstemon  | Penstemon sp. | Perennials | C |
Peony (2) | Paeonia sp. | Perennials | A |
Periwinkle | Vinca minor | Groundcovers | B |
Pernyi Holly | Ilex pernyi | Trees | C |
Persian Lilac | Syringa x persica | Shrubs | C |
Pfitzer Juniper | Juniperus chinensis 'Pfitzerana' | Shrubs | B |
Phlox  | Phlox sp. | Perennials | C |
Pincushin Flower | Scabiosa caucasica | Perennials | B |
Pink Turtlehead | Chelone sp. | Perennials | C |
Pinxterbloom Azalea | Rhododendron penclymenoides | Shrubs | D |
Pitch Pine | Pinus rigida | Trees | A |
Plumbago  | Ceratostigma plumbaginoides | Groundcovers | B |
Plume Poppy | Macleaya cordata | Perennials | B |
Plums | Prunus sp. | Trees | D |
Poppy  | Papaver sp. | Annuals | A |
Pot Marigold | Calendula sp. | Annuals | A |
Potentilla, Cinquefoil | Potentilla sp. | Perennials | A |
Primrose | Primula sp. | Perennials | B |
Prince of Wales Juniper | Juniperus horizontalis 'Prince of Wales' | Shrubs | A |
Privet | Ligustrurn sp. | Shrubs | B |
Purple Coneflower  | Echinacea purpurea | Perennials | B |
Purple Leaf Sand Cherry | Prunus x cistena | Shrubs | C |
Purple Loosestrife | Lythrum sp. | Perennials | C |
Purple Moor Grass | Molinia caerulea | Ornamental Grasses | A |
Purple Rock-Cress | Aubretia deltoidea | Perennials | A |
Pyrenees Cotoneaster | Cotoneaster congestus | Shrubs | B |
Ravenna Grass  | Erianthus ravennae | Ornamental Grasses | A |
Red Chokeberry | Aronia arbutifolia | Shrubs | B |
Red Elderberry | Sambucus racemosa | Shrubs | A |
Red Maple | Acer rubrum | Trees | B |
Red Osier Dogwood | Cornus sericea | Shrubs | B |
Red Pine | Pinus resinosa | Trees | A |
Red Twigged Dogwood | Cornus alba | Shrubs | B |
Red-Hot Poker  | Kniphofia tritoma | Perennials | B |
Redvein Enkianthus  | Enkianthus campanulatus | Shrubs | B |
Rhododendrons (1) | Rhododendron sp. | Shrubs | D |
Rhubarb | Rheum rhabarbarum | Perennials | B |
Ribbon Grass | Phalaris arundinaceae | Ornamental Grasses | B |
River Birch | Betula nigra | Trees | A |
Rock-Cress | Arabis caucasica | Perennials | A |
Rocket Ligularia  | Ligularia 'The Rocket' | Perennials | A |
Rockspray Cotoneaster | Cotoneaster horizontalis | Shrubs | B |
Rodgers Flower | Rodgersia sp. | Perennials | A |
Rose Campion | Lychnis coronaria | Perennials | A |
Rose Mallow | Hibiscus moscheutos | Perennials | C |
Rose of Sharon  | Hibiscus syriacus | Shrubs | B |
Rosebay Rhododendron | Rhododendron maximum | Shrubs | C |
Rosemary | Rosmarinus officinalis | Annuals | A |
Royal Fern | Osmunda regalis | Ferns | A |
Ruby Horsechestnut | Aesculus x carnea | Trees | B |
Rue | Ruta sp. | Perennials | A |
Rue Anemone | Anemonella thalictroides | Perennials | B |
Rugosa Rose | Rosa rugosa | Shrubs | C |
Russian Cypress  | Microbiota decussata | Shrubs | A |
Russian Olive | Elaeagnus angustifolia | Shrubs | A |
Russian Sage  | Perovskio atriplicifolia | Perennials | A |
Salvia | Salvia | Annuals | B |
Saucer Magnolia | Magnolia x soulangiana | Shrubs | B |
Savin/Tam Juniper | Juniperus sabin cv. | Shrubs | B |
Savory | Satureja montana | Perennials | B |
Scotch Pine | Pinus sylvestris | Trees | B |
Sea Buckthorn | Hippophae rhamnoides | Shrubs | B |
Sea Thrift | Armeria maritima | Perennials | B |
Sea-Holly | Eryngium sp. | Perennials | D |
Sedge | Scirpus lacustris | Ornamental Grasses | B |
Sensitive Fern | Onoclea sensibilis | Ferns | A |
Serbian Spruce | Picea omorika | Trees | B |
Shadbush | Amelanchier canadensis | Trees | B |
Shasta Daisy | Chrysanthemum superbum | Perennials | C |
Shasta Daisy | Leucanthemum maximum | Perennials | C |
Shiso | Perilla frutescens | Annuals | B |
Shore Juniper | Juniperus conferta | Shrubs | C |
Showy Sedum | Sedum spectabile | Perennials | C |
Siberian Bugloss  | Bruneria macrophylla (Brunnera) | Perennials | A |
Siberian Squill | Scilla siberica | Bulbs | A |
Silver Maple | Acer saccharinum | Trees | C |
Silver Mound  | Artemisia sp. | Perennials | A |
Singleseed Juniper (1) | Juniperus squamata cv. | Shrubs | B |
Skunk Cabbage | Symplocarpos foetidus | Perennials | B |
Small Globe Thistle | Echinops ritro | Perennials | A |
Smokebush  | Cotinus coggygria | Shrubs | B |
Smooth Hydrangea  | Hydrangea arborescens | Shrubs | C |
Snakeroot, Bugbane  | Cimcifuga sp. | Perennials | B |
Snapdragon | Antirrhinum majus | Annuals | A |
Sneezeweed | Helenium autumnale | Perennials | B |
Snowberry | Symphoricarpos albus | Shrubs | B |
Snowdrops | Galanthus nivalis | Bulbs | A |
Snow-in-Summer  | Cerastium | Perennials | B |
Snow-on-the-Mountain | Euphorbia marginata | Annuals | A |
Soapwort  | Saponaria sp. | Perennials | B |
Solomon's Seal  | Polygonatum sp. | Perennials | C |
Sourwood | Oxydendrum arboreum | Trees | B |
Speedwell | Veronica sp. | Perennials | B |
Spicebush | Lindera benzoin | Shrubs | B |
Spider Flower  | Cleome sp. | Annuals | A |
Spiderwort | Tradescantia sp. | Perennials | B |
Spotted Deadnettle  | Lamium sp. | Groundcovers | A |
Spurge | Euphorbia dulcis 'Chameleon' | Perennials | C |
Spurge  | Euphorbia sp. (except 'Chameleon') | Perennials | A |
St. John's Wort  | Hypericum calycinum | Perennials | B |
St. John's Wort  | Hypericum prolificum | Shrubs | B |
Staghorn Sumac  | Rhus typhina | Trees | C |
Statice  | Limonium latifolium | Perennials | A |
Stocks | Matthiola sp. | Annuals | B |
Stokes' Aster | Stokesia laevis | Perennials | B |
Strawberry | Fragraria sp. | Perennials | D |
Strawflower | Helichrysum | Annuals | A |
Striped Maple | Acer pensylvanicum | Trees | B |
Sugar Maple | Acer saccharum | Trees | B |
Sundrops | Oenethera sp. | Perennials | C |
Sunflower | Helianthus sp. | Annuals | C |
Swamp Milkweed | Asclepias incarnata | Perennials | B |
Sweet Alyssum | Lobularia maritima | Annuals | A |
Sweet Box  | Sarcoccoca hookeriana | Shrubs | A |
Sweet Cherry | Prunus avium | Trees | C |
Sweet Mock Orange  | Philadelphus coronarius | Shrubs | B |
Sweet Pepperbush  | Clethra sp. | Shrubs | B |
Sweet William | Dianthus barbatus | Biennials | B |
Sweet Woodruff | Galium odoratum (Asperula odorata) | Groundcovers | A |
Sweetgum | Liquidambar styraciflua | Trees | C |
Switch Grass | Panicum virgatum | Ornamental Grasses | A |
Tarragon | Artemisia dracunculus | Perennials | A |
Threadleaf Coreopsis  | Coreopsis verticillata | Perennials | A |
Thyme  | Thymus sp. | Perennials | A |
Toad Lily  | Tricyrtis hirta | Perennials | B |
Trillium | Trillium sp. | Perennials | B |
Trout Lily | Erythronium | Perennials | B |
Trumpet Creeper  | Campsis radicans | Vines | C |
Tulip | Tulip sp. | Bulbs | D |
Tulip Tree | Liriodendron tulipifera | Trees | B |
Variegated Purple Moor Grass | Molinia caerulea 'Variegata' | Ornamental Grasses | A |
Varigated Oat Grass | Arrhenatherum elatius | Ornamental Grasses | A |
Verbena | Verbena x hybrida | Annuals | B |
Violets | Viola sp. | Perennials | B |
Virginia Bluebells | Mertensia virginica | Perennials | B |
Virginia Creeper | Parthenocissus quinquifolia | Vines | C |
Virginia Sweetspire | Itea virginica | Shrubs | B |
Wallflower | Cheiranthus sp. | Annuals | B |
Wax Begonia | Begonia semperflorens | Annuals | C |
Weeping Love Grass | Eragrostus curvula | Ornamental Grasses | A |
Weigela | Weigela florida | Shrubs | B |
Western Arborvitae | Thuja plicata | Trees | C |
White Boltonia | Boltonia asteroides | Perennials | B |
White Fir | Abies concolor | Trees | C |
White Fringe Tree | Chionanthus virginicus | Trees | C |
White Oak | Quercus alba | Trees | C |
White Snakeroot | Eupatorium rugosum | Perennials | B |
White Spruce | Picea glauca | Trees | B |
Wild Ginger | Asarum canadense | Perennials | A |
Willowleaf Cotoneaster | Cotoneaster salicifolius | Shrubs | B |
Willows (1) | Salix sp. | Trees | C |
Winged Euonymus | Euonymus alata | Shrubs | C |
Winter Aconite | Eranthus hyemalis | Bulbs | A |
Winter Jasmine | Jasminum nudiflorum | Vines | B |
Winterberry Holly  | Ilex verticillata | Shrubs | B |
Wintercreeper | Euonymus fortunei | Shrubs | D |
Wintercreeper | Euonymus fortunei | Vines | D |
Wintercreeper | Euonymus fortunei | Groundcovers | C |
Wisteria | Wisteria floribunda | Vines | B |
Wood Fern | Dryopteris marginalis | Ferns | A |
Wood Sorrel | Oxalis sp. | Bulbs | B |
Yarrow | Achillea filipendulina | Perennials | B |
Yellow Birch | Betula lutea | Trees | B |
Yellow Foxglove  | Digitalis grandiflora | Perennials | B |
Yellow Wax-Bells | Kirengeshoma palmata | Perennials | B |
Yews | Taxus sp. | Shrubs | D |
Youngstown Andorra Juniper | Juniperus horizontalis 'Youngstown' | Shrubs | B |
Yucca  | Yucca filimentosa | Perennials | A |
Zinnia | Zinnia sp. | Annuals | B |