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The database

Perennials

Herbaceous perennials that return year after year.

1,429 plants

Perennials in the database

Silver Knapweed (Centaurea Ragusina) — giving this plant a delightful

Perennial

Silver Knapweed

Centaurea Ragusina

FullUSDA 4–10
Silver Leaf Astelia (Astelia Chathamica) — is a striking New Zealand native with elegant

Perennial

Silver Leaf Astelia

Astelia Chathamica

HalfUSDA 9–10
Silver Plectranthus (Plectranthus Argentatus Longwood Silver) — Tiny lavender blossoms may appear in summer, adding modest charm

Perennial

Silver Plectranthus

Plectranthus Argentatus Longwood Silver

HalfUSDA 9–10
Silver Sage (Salvia Argentea) — The leaves are the centerpiece of this plant

Biennial

Silver Sage

Salvia Argentea

FullUSDA 5–10
Silver Spear Astelia (Astelia Chathamica 'Silver Spear') — reaching up to 4 feet in length

Perennial

Silver Spear Astelia

Astelia Chathamica 'Silver Spear'

HalfUSDA 9–10
Silver Thyme (Thymus Vulgaris 'Argenteus') — It produces pale lavender flowers in early summer, offering a nectar source for pollinators

Perennial

Silver Thyme

Thymus Vulgaris 'Argenteus'

FullUSDA 5–8
Sky Blue Aster (Symphyotrichum Oolentangiense) — scientifically recognized as Symphyotrichum oolentangiense (formerly Aster oolentangiensis)

Perennial

Sky Blue Aster

Symphyotrichum Oolentangiense

FullUSDA 6–10
Smartweed, Knotweed (Persicaria Microcephala 'Red Dragon') — The leaves unfurl to a size of approximately 4 to 5 inches long; this variety is prized for its

Perennial

Smartweed, Knotweed

Persicaria Microcephala 'Red Dragon'

FullUSDA 6–9
Smooth Aster (Symphyotrichum Laeve 'Bluebird') — and a light pruning in late winter prepares it for the upcoming growing season; blue flowers in the garden

Perennial

Smooth Aster

Symphyotrichum Laeve 'Bluebird'

FullUSDA 3–8
Smooth Flax Lily (Dianella Longifolia) — Its slender, arching leaves and delicate blue flowers add texture to garden borders

Grass

Smooth Flax Lily

Dianella Longifolia

FullUSDA 8–11
Sneezeweed (Helenium Autumnale) — to maintain its appearance and health; perennial with yellow blooms

Perennial

Sneezeweed

Helenium Autumnale

FullUSDA 3–9
Sneezeweed (Helenium 'Sahin Early Flower') — commonly called Sneezewood

Perennial

Sneezeweed

Helenium 'Sahin Early Flower'

FullUSDA 3–9
Snowbank False Aster (Boltonia Asteroides 'Snowbank') — Ideal for the back of borders

Perennial

Snowbank False Aster

Boltonia Asteroides 'Snowbank'

HalfUSDA 3–8
Snowberry Tickseed (Coreopsis 'Snowberry') — Flowering from early summer to fall, it grows to an optimal height of 12-18 inches with a similar spread

Perennial

Snowberry Tickseed

Coreopsis 'Snowberry'

FullUSDA 4–9
Snowdrop Anemone (Anemone Sylvestris) — but it can tolerate a range of soil conditions.<br><br>The plant features deeply lobed leaves and striking, image 41

Ground cover

Snowdrop Anemone

Anemone Sylvestris

FullUSDA 2–9
Snowdrop Wood-Sorrel (Oxalis Magellanica) — ground-hugging clumps that extend to a spread of around 6 to 9 inches

Perennial

Snowdrop Wood-Sorrel

Oxalis Magellanica

FullUSDA 7–9
Snowflake Bacopa (Sutera Cordata 'Snowflake') — this plant thrives in full to partial sun and requires consistently moist soil

Ground cover

Snowflake Bacopa

Sutera Cordata 'Snowflake'

FullUSDA 9–11
Snow Hill Sage (Salvia X Sylvestris 'Snow Hill') — rounded clump of aromatic foliage

Perennial

Snow Hill Sage

Salvia X Sylvestris 'Snow Hill'

FullUSDA 6–10
Snow In Summer (Cerastium Tomentosum) — Snow In Summer (Cerastium tomentosum) is a vigorous, mat-forming perennial that flourishes in full sun; it boasts

Ground cover

Snow In Summer

Cerastium Tomentosum

FullUSDA 3–9
Snow In Summer (Cerastium Tomentosum 'Yo Yo') — Snow in Summer (Cerastium tomentosum 'Yo Yo') features woolly

Ground cover

Snow In Summer

Cerastium Tomentosum 'Yo Yo'

FullUSDA 3–9
Snow Queen Siberian Iris (Iris Sibirica 'Snow Queen') — Iris sibirica 'Snow Queen' is a hardy perennial

Perennial

Snow Queen Siberian Iris

Iris Sibirica 'Snow Queen'

FullUSDA 2–9
Soap Plant (Chlorogalum Pomeridianum) — grass-like leaves up to 3 feet long

Bulb

Soap Plant

Chlorogalum Pomeridianum

FullUSDA 6–10
Socialite® Triostar (Stromanthe sanguinea) — The Stromanthe sanguinea 'Triostar'

Perennial

Socialite® Triostar

Stromanthe sanguinea

HalfUSDA 10–11
Society Garlic (Tulbaghia Violacea) — perennial for full or half or shade; ensuring it as a steadfast choice for an array of design aesthetics

Perennial

Society Garlic

Tulbaghia Violacea

FullUSDA 8–10

Photographs are credited on each plant’s page.