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  | Achillea ptarmica 'Marshmallow' (Yarrow; Sneezeweed; Sneezewort) Family: Aster Family Habit: herbaceous Flowers: white Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun, partial sun |
  | Achillea ptarmica 'Peter Cottontail' (Yarrow; Sneezeweed; Sneezewort) Family: Aster Family Habit: herbaceous Flowers: white Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun, partial sun |
  | Achillea 'Terracotta' (Yarrow) Family: Aster Family Habit: herbaceous Flowers: red Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
  | Agastache 'Ava' (Hummingbird Mint) Family: Mint Family Habit: herbaceous Flowers: purple|red Nativity: Cultivated |
  | Agastache 'Blue Boa' (Hummingbird Mint; Hyssop) Family: Mint Family Habit: herbaceous Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 6 Light: sun |
  | Agastache 'Blue Fortune' (Anise Hyssop; Giant Hyssop) Family: Mint Family Habit: herbaceous Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun, partial shade |
  | Agastache 'Fall Fiesta' (Agastache; Hummingbird Mint) Family: Mint Family Habit: herbaceous Flowers: pink|orange Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun |
  | Agastache foeniculum 'Golden Jubilee' (Anise Hyssop) Family: Mint Family Habit: herbaceous Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun |
  | Agastache rupestris (Sunset Hyssop; Threadleaf Giant Hyssop) Family: Mint Family Habit: herbaceous Flowers: orange Nativity: SW United States (New Mexico, Arizona) Hardiness: USDA Zone 5 Soil: Well-drained soils Light: sun, partial shade |
 | Agastache rupestris 'Apache Sunset' (Sunset Hyssop; Threadleaf Giant Hyssop) Family: Mint Family Habit: herbaceous Flowers: orange|pink Nativity: Cultivated Hardiness: USDA Zone 6 Light: sun |
  | Ajuga reptans 'Binblasca' BLACK SCALLOP (Carpet Bugle; Bugleweed) Family: Mint Family Habit: herbaceous Nativity: Cultivated Light: sun, partial shade |
  | Allium 'Globemaster' (Ornamental Onion) Family: Amaryllis Family Habit: geophyte Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial sun |
  | Amsonia tabernaemontana 'Storm Cloud' (Bluestar) Family: Dogbane Family Habit: herbaceous Flowers: blue Nativity: Cultivated Hardiness: USDA Zone 4 Light: partial sun, sun |
  | Angelica gigas (Purple Angelica; Korean Angelica) Family: Carrot Family Habit: herbaceous Flowers: purple Nativity: China (Manchuria), Japan, Korea Hardiness: USDA Zone 6 Soil: slightly moist Light: partial sun, partial shade |
 | Artemisia abrotanum 'Leprechaun' (Southernwood) Family: Aster Family Habit: shrub Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
  | Artemisia ludoviciana 'Valerie Finnis' (White Sage; Western Mugwort) Family: Aster Family Habit: herbaceous; rhizome Flowers: yellow Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
 | Artemisia stelleriana Silver Bullet® (Wormwood) Family: Aster Family Habit: herbaceous Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun |
 | Aster × frikartii 'Monch' (Frikart's Aster; Michaelmas Daisy) Family: Aster Family Habit: herbaceous Flowers: purple|orange Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun, partial sun |
 | Aster tataricus 'Jindai' (Tatarian Aster) Family: Aster Family Habit: herbaceous Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
 | Baptisia alba (White Wild Indigo; Prairie Indigo; False Indigo) Family: Bean Family Habit: herbaceous Flowers: white Nativity: E & C United States Hardiness: USDA Zone 5 Light: sun, partial shade |
 | Baptisia 'Cherries Jubilee' DECADENCE® (False Indigo) Family: Bean Family Habit: herbaceous Flowers: red|yellow Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial shade |
 | Baptisia 'Pink Truffles' DECADENCE® (False Indigo) Family: Bean Family Habit: herbaceous Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial shade |
  | Baptisia 'Purple Smoke' (False Indigo; Wild Indigo) Family: Bean Family Habit: herbaceous Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial sun |
  | Boltonia asteroides var. latisquama 'Snowbank' (Boltonia; False Chamomile; White Doll's Daisy) Family: Aster Family Habit: herbaceous; rhizome Flowers: white|yellow Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
  | Buddleja 'Grand Cascade' (Butterfly Bush) Family: Figwort Family Habit: shrub Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun |
 | Camassia leichtlinii (Large Camas; California White Quamash) Family: Asparagus Family Habit: geophyte; herbaceous Flowers: white|cream|blue|purple Nativity: W North America Hardiness: USDA Zone 5 Light: sun |
  | Camassia leichtlinii ssp. suksdorfii (Caerulea Group) (Suksdorf's Large Camas) Family: Asparagus Family Habit: geophyte; herbaceous Flowers: blue Nativity: Cultivated Hardiness: USDA Zone 3 Light: partial sun |
  | Cephalaria gigantea (Giant Scabiosa; Yellow Scabiosa; Tartarian Cephalaria) Family: Honeysuckle Family Habit: herbaceous Flowers: yellow Nativity: Caucasus, Siberia Hardiness: USDA Zone 3 Soil: moderately fertile, moisture retentive- clay to silty loams Light: sun |
  | Chilopsis linearis 'Bubba' (Desert Willow) Family: Trumpet-Creeper Family Habit: tree Flowers: pink Nativity: Cultivated Light: sun |
  | Chionanthus retusus (Chinese Fringetree) Family: Olive Family Habit: shrub/tree Flowers: white Nativity: China, Japan, Korea, Taiwan Hardiness: USDA Zone 6 Light: sun |
  | Clematis hexapetala (Mongolian Snowflakes; Clematis; Six-Petal Clematis) Family: Buttercup Family Habit: herbaceous Flowers: white Nativity: Siberia to N Korea Hardiness: USDA Zone 5 Light: sun, partial sun |
 | Clematis 'Lime Close' SERIOUS BLACK™ (Clematis) Family: Buttercup Family Habit: herbaceous Flowers: white Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
 | Clinopodium nepeta 'White Cloud' (Lesser Calamint) Family: Mint Family Habit: herbaceous Flowers: white Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun |
  | Coreopsis Cream 'Balupteam' UPTICK™ (Coreopsis; Tickseed) Family: Aster Family Habit: herbaceous Flowers: cream Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun |
  | Coreopsis 'Novcorcar' CREME CARAMEL™ (Thread Leaf Tickseed; Tickseed) Family: Aster Family Habit: herbaceous Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun |
  | Coreopsis 'Shades of Rose' Permathread™ (Threadleaf Coreopsis; Tickseed) Family: Aster Family Habit: herbaceous Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun, partial sun |
 | Coreopsis tripteris 'Flower Tower' (Tickseed) Family: Aster Family Habit: herbaceous Flowers: yellow Nativity: Cultivated Light: sun |
  | Coreopsis tripteris 'Gold Standard' (Tall Tickseed) Family: Aster Family Habit: herbaceous Flowers: yellow Nativity: Cultivated Hardiness: USDA Zone 3 |
 | Cotinus coggygria 'NCCO1' Winecraft Black® (Smokebush) Family: Sumac Family Habit: tree Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
  | Crambe cordifolia (Colewort; Greater Sea Kale) Family: Mustard Family Habit: herbaceous Flowers: white Nativity: Temperate Asia Hardiness: USDA Zone 5 Light: sun |
  | Crambe maritima (Sea Kale; Curly Leaf Sea Kale) Family: Mustard Family Habit: herbaceous Flowers: white Nativity: Europe to Caucasus Hardiness: USDA Zone 4 Soil: Well-drained, sandy, clay, loam Light: sun |
  | Dalea purpurea (Purple Prairie Clover) Family: Bean Family Habit: herbaceous Flowers: red-violet|red|purple Nativity: SC Canada, C United States, including Colorado Hardiness: USDA Zone 4 Light: sun |
  | Delphinium 'Astolat' (Pacific Hybrids Group) (Delphinium) Family: Buttercup Family Habit: herbaceous Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
  | Dianthus giganteus (Pink) Family: Pink Family Habit: herbaceous Flowers: pink|purple Nativity: Balkan Peninsula Hardiness: USDA Zone 5 Soil: Well-drained soil Light: sun, partial sun, partial shade |
 | Digitalis ferruginea 'Gigantea Gelber Herold' (Rusty Foxglove) Family: Plantain Family Habit: herbaceous Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial shade |
 | Echinacea Hot Coral 'Balsomcor' Sombrero® (Coneflower) Family: Aster Family Habit: herbaceous Flowers: red Nativity: Cultivated Hardiness: USDA Zone 4 |
 | Echinacea purpurea 'Green Twister' (Purple Coneflower) Family: Aster Family Habit: herbaceous Flowers: yellow|green Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
  | Echinacea purpurea 'White Swan' (Coneflower) Family: Aster Family Habit: herbaceous Flowers: white|gold|brown Nativity: Cultivated Hardiness: USDA Zone 3 Soil: Dry to moist well-drained soil Light: partial sun, sun |
  | Echinops bannaticus 'Blue Glow' (Globe Thistle; Blue Globe Thistle) Family: Aster Family Habit: herbaceous Flowers: blue Nativity: Cultivated Hardiness: USDA Zone 3 Soil: Well-drained soil Light: sun |
  | Echinops bannaticus 'Taplow Blue' (Globe Thistle) Family: Aster Family Habit: herbaceous Flowers: blue Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun, partial sun |
 | Echinops bannaticus 'The Giant' (Globe Thistle; Blue Globe Thistle) Family: Aster Family Habit: herbaceous Nativity: Cultivated Light: sun |
  | Epilobium canum 'Sierra Salmon' (California Fuchsia; Hummingbird Trumpet) Family: Evening Primrose Family Habit: herbaceous Flowers: red Nativity: Cultivated Hardiness: USDA Zone 6 Light: sun |
  | Eremurus himalaicus (Himalayan Foxtail Lily; Desert Candle; Foxtail Lily) Family: Grasstree Family Habit: geophyte Flowers: white Nativity: Afghanistan, NW Himalaya Hardiness: USDA Zone 3 Soil: Well-drained soil; Average moisture Light: sun |
  | Erodium chrysanthum (Yellow Stork's Bill; Golden Storksbill) Family: Geranium Family Habit: herbaceous Flowers: yellow Nativity: Greece Hardiness: USDA Zone 4 Light: sun, partial shade |
  | Eryngium giganteum (Miss Willmott's Ghost; Stout Eryngo) Family: Carrot Family Habit: herbaceous Flowers: purple Nativity: Caucasus Hardiness: USDA Zone 5 Light: sun |
  | Eryngium yuccifolium (Rattlesnake Master; Button Snakeroot) Family: Carrot Family Habit: herbaceous Flowers: white Nativity: E & C United States Hardiness: USDA Zone 3 Light: sun |
 | Festuca glauca 'Elijah Blue' (Blue Fescue) Family: Grass Family Habit: grass/sedge Flowers: green|purple Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial sun |
  | Forestiera pubescens (Stretchberry; Elbowbush; Spring Herald) Family: Olive Family Habit: shrub/tree Flowers: green Nativity: SW to SC United States, N Mexico Light: sun |
  | Gaillardia × grandiflora Red 'PAS933516' MESA™ (Blanket Flower) Family: Aster Family Habit: herbaceous Flowers: red Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
 | Geranium 'Ann Folkard' (Cranesbill) Family: Geranium Family Habit: herbaceous Flowers: purple Nativity: Cultivated Light: sun, partial shade |
 | Gladiolus × byzantinus (Byzantine Gladiolus) Family: Iris Family Habit: herbaceous; geophyte Flowers: pink Nativity: W Mediterranean Hardiness: USDA Zone 7A Light: sun |
  | Hedera helix 'California Gold' (English Ivy) Family: Ginseng Family Habit: vine; herbaceous Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun, partial shade |
  | Helenium autumnale 'Helena Rote Töne' Helena Red Shades (Sneezeweed; Autumn Sneezeweed) Family: Aster Family Habit: herbaceous Flowers: red Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
  | Helianthus maximiliani (Maximilian's Sunflower) Family: Aster Family Habit: herbaceous Flowers: yellow Nativity: Canada to N Mexico Hardiness: USDA Zone 4 Light: sun |
 | Heliopsis helianthoides var. scabra 'Bleeding Hearts' (Smooth Ox-eye) Family: Aster Family Habit: herbaceous Flowers: orange|red Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
  | Hemerocallis 'Bela Lugosi' (Daylily) Family: Asphodel Family Habit: herbaceous; rhizome Flowers: purple|green Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial shade |
 | Iris 'Absolute Treasure' (Iris; Bearded Iris) Family: Iris Family Habit: rhizome Flowers: blue Nativity: Cultivated |
 | Iris 'Cold As Ice' (Iris ) Family: Iris Family Habit: rhizome; herbaceous Flowers: blue Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun, partial sun, partial shade |
  | Iris 'Hello Darkness' (Iris; Bearded Iris) Family: Iris Family Habit: rhizome; herbaceous Flowers: purple|black Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
 | Iris 'Señor Jinx' (Iris ) Family: Iris Family Habit: rhizome; herbaceous Flowers: black Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun, partial sun, partial shade |
  | Juniperus scopulorum (Rocky Mountain Juniper; Rocky Mountain Red Cedar) Family: Cypress Family Habit: tree; shrub/tree Nativity: W North America (Rocky Mts) Hardiness: USDA Zone 3 Light: sun |
  | Kniphofia uvaria (Tritoma; Pokerplant; Red Hot Poker; Torchflower) Family: Asphodel Family Habit: rhizome; herbaceous Flowers: red|yellow|orange Nativity: South Africa (Cape Province) Hardiness: USDA Zone 5A Soil: neutral pH, well-drained soil Light: sun |
  | Kniphofia uvaria 'Lola' (Red Hot Poker) Family: Asphodel Family Habit: rhizome; herbaceous Flowers: red|yellow Nativity: Cultivated Hardiness: USDA Zone 6 Light: sun |
  | Kniphofia uvaria 'Nobilis' (Torch Lily; Red Hot Poker; Torchflower) Family: Asphodel Family Habit: rhizome; herbaceous Flowers: orange|yellow Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun, partial sun |
  | Liatris ligulistylis (Meadow Blazing Star; Large Headed Liatris; Rocky Mountain Blazing Star; Northern Plains Gayfeather) Family: Aster Family Habit: herbaceous Flowers: purple Nativity: SC Canada, NC United States to New Mexico Hardiness: USDA Zone 3 Light: sun |
  | Liatris spicata 'Alba' (Button Snakewort; Gayfeather) Family: Aster Family Habit: herbaceous; geophyte Flowers: white Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
  | Linum lewisii (Prairie Flax; Wild Blue Flax) Family: Flax Family Habit: herbaceous Flowers: blue Nativity: Canada, United States, N Mexico Hardiness: USDA Zone 5 Light: sun |
 | Miscanthus sinensis 'Little Kitten' (Dwarf Maiden Grass) Family: Grass Family Habit: grass/sedge Flowers: silver Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun, partial shade |
  | Miscanthus sinensis 'Morning Light' (Silver Grass; Maiden Grass; Eulalia) Family: Grass Family Habit: grass/sedge; rhizome Flowers: red Nativity: Cultivated Hardiness: USDA Zone 4 Soil: Well-drained, fertile soil Light: sun, partial sun |
  | Muhlenbergia reverchonii 'PUND01S' UNDAUNTED® (Ruby Muhly; Seep Muhly) Family: Grass Family Habit: grass/sedge Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 5 Soil: clay or sandy Light: sun |
  | Panicum virgatum 'Dallas Blues' (Switch Grass; Switchgrass) Family: Grass Family Habit: grass/sedge; rhizome Flowers: red Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial sun |
  | Panicum virgatum 'Heavy Metal' (Switch Grass; Switchgrass) Family: Grass Family Habit: grass/sedge Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 4A Soil: Moist, but can tolerate dry to boggy soils Light: sun, partial sun, partial shade |
  | Papaver orientale 'Helen Elisabeth' (Poppy) Family: Poppy Family Habit: herbaceous Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
 | Papaver orientale 'Raspberry Queen' (Poppy) Family: Poppy Family Habit: herbaceous Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
  | Papaver orientale 'Royal Wedding' (Poppy) Family: Poppy Family Habit: herbaceous Flowers: white|black Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
  | Parthenium integrifolium (Wild Quinine; American Feverfew; Missouri Snakeroot; Prairie Dock) Family: Aster Family Habit: herbaceous Flowers: white Nativity: E United States Hardiness: USDA Zone 4 Light: sun, partial sun |
  | Patrinia scabiosifolia (Golden Lace) Family: Honeysuckle Family Habit: herbaceous Flowers: yellow Nativity: Temperate Asia Hardiness: USDA Zone 5 Light: sun, partial shade |
  | Pennisetum orientale 'Karley Rose' (Pennisetum; White Fountain Grass; Fountain Grass) Family: Grass Family Habit: grass/sedge Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 6 Light: sun |
  | Penstemon barbatus 'Rubycunda' (Scarlet Bugler) Family: Plantain Family Habit: herbaceous Flowers: red Nativity: Cultivated Hardiness: USDA Zone 4 |
  | Penstemon eatonii (Eaton's Firecracker; Eaton's Penstemon; Firecracker Penstemon) Family: Plantain Family Habit: herbaceous Flowers: red Nativity: SW United States Hardiness: USDA Zone 4 Light: sun, partial shade |
  | Penstemon eatonii Richfield selection (Firecracker penstemon) Family: Plantain Family Habit: herbaceous Flowers: red Nativity: Cultivated Hardiness: USDA Zone 4 |
  | Penstemon grandiflorus (Large Beardtongue) Family: Plantain Family Habit: herbaceous Flowers: purple Nativity: C United States Hardiness: USDA Zone 3 Light: sun |
  | Penstemon grandiflorus 'P010S' PRAIRIE JEWEL® (Large Beardtongue) Family: Plantain Family Habit: herbaceous Flowers: red|pink|purple Nativity: Cultivated Hardiness: USDA Zone 3 Soil: Moderate water to dry; well-drained soil Light: sun |
  | Penstemon palmeri (Palmer's Penstemon; Scented Penstemon) Family: Plantain Family Habit: herbaceous; sub-shrub Flowers: pink Nativity: SW United States to New Mexico Hardiness: USDA Zone 5 Light: sun |
  | Penstemon pinifolius Sunset Glow 'P019S' STEPPESUNS® (Pineleaf Penstemon) Family: Plantain Family Habit: herbaceous Flowers: orange Nativity: Cultivated |
 | Penstemon 'Raven' (Penstemon) Family: Plantain Family Flowers: purple|white Nativity: Cultivated |
  | Penstemon rostriflorus (Bridge Penstemon; Bridges' Penstemon) Family: Plantain Family Habit: sub-shrub; herbaceous Flowers: red Nativity: SW United States, NW Mexico Hardiness: USDA Zone 4B Light: sun, partial shade |
 | Phygelius capensis 'Magenta' (Cape Fuchsia) Family: Figwort Family Habit: herbaceous; herbaceous Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 7 Light: sun |
  | Pycnanthemum muticum (Mountain Mint; Clustered Mountainmint ) Family: Mint Family Habit: herbaceous Flowers: white Nativity: E. United States |
  | Ratibida columnifera (Prairie Coneflower; Long-Head Coneflower) Family: Aster Family Habit: herbaceous Flowers: yellow|red Nativity: North America Hardiness: USDA Zone 4 Light: sun |
 | Ratibida columnifera 'Red Midget' (Prairie Coneflower; Mexican Hat) Family: Aster Family Habit: herbaceous Flowers: red|yellow Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial sun |
  | Rudbeckia laciniata 'Herbstsonne' Autumn Sun (Cutleaf Coneflower) Family: Aster Family Habit: herbaceous; rhizome Flowers: yellow|green Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial sun |
  | Rudbeckia maxima (Giant Coneflower; Cabbage Coneflower) Family: Aster Family Habit: herbaceous; rhizome Flowers: yellow|brown Nativity: SC United States Hardiness: USDA Zone 4 Light: sun |
  | Ruellia humilis (Wild Petunia; Fringeleaf Wild Petunia) Family: Acanthus Family Habit: herbaceous Flowers: purple Nativity: E & C United States Hardiness: USDA Zone 5 Light: sun, partial shade |
  | Salvia azurea var. grandiflora (Pitcher Sage; Azure Sage; Blue Sage) Family: Mint Family Habit: herbaceous; rhizome Flowers: blue Nativity: E & C United States Hardiness: USDA Zone 4 Light: sun |
 | Salvia moorcroftiana × indica (Shangri-la Sage) Family: Mint Family Habit: herbaceous Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 5 Soil: moderate to dry Light: sun |
 | Salvia nemorosa 'Bumbleberry' (Salvia; Garden Sage) Family: Mint Family Habit: herbaceous Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
  | Salvia nemorosa 'Bumbleblue' (Salvia; Garden Sage) Family: Mint Family Habit: herbaceous Flowers: blue Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
 | Salvia nutans (Nodding Sage) Family: Mint Family Habit: herbaceous Flowers: blue Nativity: E Europe Hardiness: USDA Zone 3 Light: sun |
  | Sambucus nigra 'Eva' BLACK LACE® (Black Elder; European Elder) Family: Viburnum Family Habit: shrub Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial shade |
 | Sanguisorba tenuifolia 'Alba' (Japanese Burnet) Family: Rose Family Habit: herbaceous Flowers: white Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial shade, shade |
 | Santolina etrusca Family: Aster Family Habit: herbaceous Flowers: cream Nativity: Italy Hardiness: USDA Zone 6 |
  | Scabiosa caucasica 'Fama Deep Blue' (Pincushion Flower; Sweet Scabious; Caucasian Pincushion Flower; Perennial Scabiosa) Family: Honeysuckle Family Habit: herbaceous Flowers: blue Nativity: Cultivated Hardiness: USDA Zone 3 Soil: moist, well-drained, slightly alkaline soil Light: sun, partial shade |
  | Schizachyrium scoparium 'MinnblueA' BLUE HEAVEN® (Little Bluestem; Blue Stem) Family: Grass Family Habit: grass/sedge Flowers: red Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun, partial sun |
 | Schizachyrium scoparium 'Twilight Zone' (Little Bluestem; Blue Stem; Broom Beard Grass) Family: Grass Family Habit: grass/sedge Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
  | Sedum telephium Black 'Desert Black' DESERT™ (Live-Forever Sedum; Autumn Stonecrop) Family: Stonecrop Family Habit: cactus/succulent Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
 | Sedum telephium 'Marina' (Live-Forever Sedum; Autumn Stonecrop) Family: Stonecrop Family Habit: cactus/succulent Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
  | Silene flos-cuculi 'Petite Jenny' (Ragged Robin; Meadow Campion) Family: Pink Family Habit: herbaceous Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun, partial shade |
 | Sisyrinchium angustifolium 'Lucerne' (Blue-eyed Grass) Family: Iris Family Habit: geophyte; herbaceous Flowers: blue Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
 | Sisyrinchium angustifolium 'Suwannee' (Blue-eyed Grass) Family: Iris Family Habit: geophyte; herbaceous Flowers: blue Nativity: Cultivated Hardiness: USDA Zone 6A Light: sun, partial shade |
  | Solidago rugosa 'Fireworks' (Goldenrod; Rough Goldenrod) Family: Aster Family Habit: herbaceous; rhizome Flowers: yellow Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun, partial sun |
  | Sorghastrum nutans 'Indian Steel' (Golden Prairie Grass; Indian Grass; Indiangrass; Wood Grass) Family: Grass Family Habit: grass/sedge Flowers: yellow Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
  | Sporobolus heterolepis (Prairie Dropseed) Family: Grass Family Habit: grass/sedge Flowers: pink|brown Nativity: C & E Canada to SC & SE United States Hardiness: USDA Zone 3 Soil: Sand or loam soil Light: sun, partial sun |
  | Sporobolus wrightii (Sacaton; Big Sacaton; Giant Sacaton) Family: Grass Family Habit: grass/sedge Flowers: gold|green Nativity: C & SW United States, N Mexico Hardiness: USDA Zone 5 Light: sun, partial shade |
  | Stachys monieri 'Hummelo' (Alpine Betony; Betony) Family: Mint Family Habit: herbaceous Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun, partial sun |
 | Symphyotrichum laeve (Smooth Blue Aster; Smooth Aster) Family: Aster Family Habit: herbaceous Flowers: blue Nativity: Canada to N Mexico Hardiness: USDA Zone 4A Light: sun, partial sun |
  | Symphyotrichum lateriflorum 'Lady in Black' (Calico Aster) Family: Aster Family Habit: herbaceous Flowers: white|pink Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun, partial sun |
  | Symphyotrichum novae-angliae 'Septemberrubin' September Ruby (New England Aster; Fall Aster) Family: Aster Family Habit: herbaceous; rhizome Flowers: pink|yellow Nativity: Cultivated Hardiness: USDA Zone 4 Light: sun |
  | Symphyotrichum oblongifolium (Aromatic Aster; Oblong-Leaf Aster) Family: Aster Family Habit: herbaceous Flowers: purple|yellow Nativity: C & E United States to NE Mexico Hardiness: USDA Zone 3 Light: sun |
  | Tulipa Best Purple (Tulip) Family: Lily Family Habit: geophyte; herbaceous Flowers: purple Nativity: Cultivated Hardiness: USDA Zone 3 Light: sun |
 | Verbascum 'Cotswold King' (Mullein) Family: Figwort Family Habit: herbaceous Flowers: yellow Nativity: Cultivated Hardiness: USDA Zone 7 Light: sun, partial sun |
  | Verbascum 'Gainsborough' (Mullein) Family: Figwort Family Habit: herbaceous Flowers: yellow Nativity: Cultivated Hardiness: USDA Zone 5A Light: sun |
 | Verbascum 'Helen Johnson' (Verbascum; Mullein) Family: Figwort Family Habit: herbaceous Flowers: pink|orange Nativity: cultivated |
  | Verbascum phoeniceum (Purple Mullein) Family: Figwort Family Habit: herbaceous Flowers: red|purple Nativity: Europe to W China and NW. Iran |
 | Verbascum phoeniceum 'Violetta' (Purple Mullein) Family: Figwort Family Habit: herbaceous Flowers: purple Nativity: Cultivated |
 | Verbascum 'Pink Domino' (Cotswold Group) (Chaix Mullein; Nettle-Leaved Mullein) Family: Figwort Family Habit: herbaceous Flowers: pink|red Nativity: Cultivated |
  | Verbascum 'Southern Charm' (Verbascum; Mullein) Family: Figwort Family Habit: herbaceous Flowers: pink Nativity: Cultivated Hardiness: USDA Zone 5 Light: sun |
 | Verbascum 'White Domino' (Mullein) Family: Figwort Family Habit: herbaceous Flowers: white Nativity: Cultivated Hardiness: USDA Zone 5A Light: sun, partial sun |
  | Verbascum wiedemannianum (Indigo Mullein; Candlewick Plant) Family: Figwort Family Habit: herbaceous Flowers: purple Nativity: Turkey Hardiness: USDA Zone 7 Light: sun |
  | Veronica oltensis (Thyme-Leaf Speedwell) Family: Plantain Family Habit: herbaceous Flowers: blue Nativity: Turkey Hardiness: USDA Zone 3 Light: sun |
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Photography © Denver Botanic Gardens
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