Plants hardy in Zone 6 (hardy to -23°C or -10°F)
- Acaena inermis 'Purpurea' (Purple Sheep Burr)
- Adiantum pedatum (American Maidenhair Fern)
- Ajuga reptans 'Burgundy' (Carpet Bugle)
- Alchemilla ellenbeckii (Creeping Lady's Mantle)
- Anacyclus pyrethrum var. depressus (Mt. Atlas Daisy)
- Antennaria dioica 'Rubra' (Pink Pussy-toes)
- Aquilegia formosa (Crimson Columbine)
- Arabis ferdinandi-coburgi 'Variegata' (Alpine Wall Cress)
- Arctostaphylos uva-ursi (Kinnikinnick)
- Arenaria balearica (Corsican Sandwort)
- Armeria maritima (Sea Thrift)
- Armeria maritima 'Alba' (White-flowered Thrift)
- Armeria maritima 'Rubrifolia' (Red-leaved Thrift)
- Athyrium niponicum var. pictum (Japanese Painted Fern)
- Azorella trifurcata 'Nana' (Cushion Bolax)
- Blechnum penna-marina (Alpine Water Fern)
- Blechnum spicant (Deer Fern)
- Calluna vulgaris 'Corbett's Red' (Scotch Heather)
- Calluna vulgaris 'County Wicklow' (Scotch Heather)
- Calluna vulgaris 'Dark Beauty' (Scotch Heather)
- Calluna vulgaris 'Dark Star' (Scotch Heather)
- Calluna vulgaris 'Foya' (Scotch Heather)
- Calluna vulgaris 'Red Favorit' (Scotch Heather)
- Calluna vulgaris 'Silver Knight' (Scotch Heather)
- Calluna vulgaris 'Strawberry Delight' (Scotch Heather)
- Calluna vulgaris 'White Coral' (Scotch Heather)
- Cardamine trifolia (Trifoliate Bittercress)
- Cerastium tomentosum (Snow in Summer)
- Cheilanthes lanosa (Hairy Lip Fern)
- Cornus canadensis (Bunchberry)
- Cotoneaster dammeri (Bearberry Cotoneaster)
- Cotoneaster dammeri 'Eichholz'
- Cotoneaster salicifolius 'Repens' (Willowleaf Cotoneaster)
- Cyclamen coum (Hardy Winter Cyclamen)
- Cyclamen hederifolium 'Silver Lace' (Baby Cyclamen)
- Draba brunifolia (Whitlow Grass)
- Dryopteris dilatata 'Lepidota Cristata'
- Dryopteris erythrosora (Autumn Fern)
- Dryopteris filix-mas 'Barnesii' (Barnes' Narrow Male Fern)
- Dryopteris filix-mas 'Linearis Polydactyla'
- Duchesnea indica 'Harlequin' (Mock Strawberry)
- Epimedium grandiflorum (Bishop's Hat)
- Erica carnea 'Beoley Pink' (Spring Heath)
- Erica carnea 'Ice Princess' (Spring Heath)
- Erica carnea 'Lohse's Rubin' (Spring Heath)
- Erica carnea 'Rosalie' (Spring Heath)
- Erica carnea 'Rosantha' (Spring Heath)
- Erica × darleyensis 'Kramer's Rote' (Darley Dale Heath)
- Erica × darleyensis 'Mary Helen' (Darley Dale Heath)
- Erica vagans 'Mrs. D.F. Maxwell' (Cornish Heath)
- Erigeron karvinskianus 'Profusion' (Mexican Daisy)
- Euonymus fortunei 'Emerald Gaiety' (Japanese Euonymus)
- Euonymus fortunei 'Emerald 'n Gold' (Japanese Euonymus)
- Euonymus fortunei 'Gold Spot'
- Euonymus fortunei 'Kewensis' (Miniature Wintercreeper)
- Euphorbia amygdaloides var. robbiae (Mrs. Robb’s Bonnet)
- Festuca glauca 'Elijah Blue' (Blue Fescue)
- Fragaria chiloensis (Beach Strawberry)
- Galium odoratum (Sweet Woodruff)
- Gaultheria procumbens (Wintergreen)
- Gaultheria shallon (Salal)
- Genista pilosa 'Vancouver Gold' (Creeping Broom)
- Geranium × cantabrigiense 'Cambridge' (Dwarf Cranesbill)
- Geranium sanguineum (Bloody Cranesbill)
- Gymnocarpium dryopteris (Western Oak Fern)
- Hedera helix (English Ivy)
- Hedera helix 'Baltica' (Baltic Ivy)
- Hedera helix 'Duckfoot'
- Hedera helix 'Glacier'
- Hedera helix 'Gold Child'
- Hedera helix 'Gold Heart'
- Hedera helix 'Hahn's Self Branching'
- Hedera helix 'Mystery'
- Hedera helix 'Needlepoint'
- Hedera helix 'Pixie' (Mini Needlepoint)
- Hedera helix 'Springfield'
- Hedera helix 'Thorndale' (Thorndale Ivy)
- Herniaria glabra (Rupturewort)
- Houttuynia cordata 'Chameleon' (Chameleon Plant)
- Hypericum calycinum (St. John's Wort)
- Hypericum empetrifolium ssp. oliganthum
- Hypericum × moserianum 'Tricolour'
- Hypericum polyphyllum 'Grandiflorum'
- Iris setosa 'Pristine Blue'
- Lavandula angustifolia 'Hidcote' (English Lavender)
- Lavandula angustifolia 'Munstead' (English Lavender)
- Lavandula × intermedia 'Provence' (Blue Lavandin)
- Leptinella minor (Alpine Brass Buttons)
- Leptinella potentillina (Chatham Brass Buttons)
- Leptinella squalida (Green Brass Buttons)
- Leptinella squalida 'Platt’s Black' (Brass-Buttons)
- Lithodora diffusa 'Grace Ward' (Blue Lithospermum)
- Lysichiton americanus (Yellow Skunk Cabbage)
- Mahonia nervosa (Oregon Grape)
- Mahonia repens (Creeping Oregon Grape)
- Mentha requienii (Corsican Mint)
- Oxalis magellanica 'Nelson' (Australian Sorrel)
- Pachysandra terminalis (Japanese Spurge)
- Pachysandra terminalis 'Silver Edge' (Var. Jap. Spurge)
- Paxistima canbyi (Canby's Mountain Lover)
- Polypodium vulgare (Wall Polypody)
- Polystichum munitum (Western Sword Fern)
- Polystichum polyblepharum (Japanese Tassel Fern)
- Polystichum setiferum 'Plumosum' (Soft Shield Fern)
- Potentilla neumanniana 'Nana' (Alpine Cinquefoil)
- Potentilla tridentata 'Nuuk' (Wineleaf Cinquefoil)
- Pratia pedunculata (Blue Star Creeper)
- Pratia pedunculata 'County Park' (Kelsey Blue)
- Sagina subulata (Irish Moss)
- Sagina subulata 'Aurea' (Scotch Moss)
- Saponaria ocymoides (Rock Soapwort)
- Saponaria ocymoides 'Rubra Compacta' (Rock Soapwort)
- Saxifraga crustata (Encrusted Saxifrage)
- S. × urbium 'Primuloides' (Dwarf London Pride)
- Sedum acre 'Aureum' (Golden Stonecrop)
- Sedum pachyclados
- Sedum cauticola 'Lidakense' (Blue and Plum Stonecrop)
- Sedum hispanicum minus (Blue Carpet)
- Sedum rupestre 'Angelina'
- Sedum spathulifolium 'Cape Blanco'
- Sedum spurium 'John Creech' (John Creech Stonecrop)
- Sedum spurium 'Schorbuser Blut' (Dragon's Blood)
- Sempervivum (Hens & Chicks)
- Silene uniflora 'Druett's Variegated' (Rock Campion)
- Sisyrinchium montanum (Strict Blue-Eyed Grass)
- Soldanella alpina (Alpine Snowbell)
- Thymus × citriodorus 'Gold Edge' (Golden Lemon Thyme)
- Thymus doerfleri 'Bressingham' (Bressingham Thyme)
- Thymus 'Doone Valley' (Creeping Thyme)
- Thymus 'Hartington Silver' (Hartington Silver Thyme)
- Thymus leucotrichus (Moonlight Thyme)
- Thymus praecox 'Albiflorus' (White Moss Thyme)
- Thymus praecox 'Elfin' (Creeping Thyme)
- Thymus pseudolanuginosus (Woolly Thyme)
- Thymus serpyllum (Mother of Thyme)
- Thymus serpyllum var. coccineus (Creeping Red Thyme)
- Thymus thracicus (Lavender Thyme)
- Vaccinium ovalifolium (Oval Leaf Huckleberry)
- Vaccinium oxycoccus (Bog Cranberry)
- Vancouveria hexandra (American Barrenwort)
- Veronica liwanensis (Turkish Speedwell)
- Veronica whitleyi (Whitley's Speedwell)
- Vinca minor 'Atropurpurea' (Purple Periwinkle)
- Vinca minor 'Bowles' Blue' (Blue Periwinkle)
- Vinca minor 'Double Blue'
- Vinca minor 'Double Purple'
- Vinca minor 'Gertrude Jekyll' (White Periwinkle)
- Vinca minor 'Ralph Shugert' (Variegated Periwinkle)
- Waldsteinia fragariodes (Barren Strawberry)
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