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The database

Perennials

Herbaceous perennials that return year after year.

1,429 plants

Perennials in the database

Inside-out Flower (Vancouveria Hexandra) — commonly called American Barrenwort

Ground cover

Inside-out Flower

Vancouveria Hexandra

FullUSDA 3–9
Irene Nuss Begonia (Begonia 'Irene Nuss') — heart-shaped leaves display rich green hues with a waxy sheen

Perennial

Irene Nuss Begonia

Begonia 'Irene Nuss'

HalfUSDA 3–10
Irene Rosemary (Rosmarinus Officinalis 'Irene') — commonly named Irene Rosemary

Herb

Irene Rosemary

Rosmarinus Officinalis 'Irene'

FullUSDA 8–10
Irish Moss (Sagina Subulata) — spreading around 12 inches in width

Ground cover

Irish Moss

Sagina Subulata

FullUSDA 4–10
Iris Species (Iris Spp.) — offer a captivating array of colors, often with intricate patterns

Perennial

Iris Species

Iris Spp.

FullUSDA 7–9
Iron Butterfly Vernonia (Vernonia Lettermanii 'Iron Butterfly') — showcasing thread-like leaves on sturdy stems

Perennial

Iron Butterfly Vernonia

Vernonia Lettermanii 'Iron Butterfly'

FullUSDA 4–9
Iron Cross Begonia (Begonia Masoniana) — This striking plant thrives in well-drained, humus-rich soil and requires consistent moisture

Perennial

Iron Cross Begonia

Begonia Masoniana

FullUSDA 3–10
Island Alum Root (Heuchera Maxima) — these plants are ideal for edging and ground cover in partial shade

Ground cover

Island Alum Root

Heuchera Maxima

HalfUSDA 7–10
Island Bush Snapdragon (Gambelia Speciosa) — which attract hummingbirds

Ground cover

Island Bush Snapdragon

Gambelia Speciosa

FullUSDA 8–10
Island Pink Yarrow (Achillea Millefolium 'Island Pink') — drought-tolerant perennial

Ground cover

Island Pink Yarrow

Achillea Millefolium 'Island Pink'

FullUSDA 3–10
Ivory Prince Hellebore (Helleborus 'Ivory Prince') — Its leathery, dark green foliage forms a tidy clump about 12 inches tall and 24 inches wide

Perennial

Ivory Prince Hellebore

Helleborus 'Ivory Prince'

FullUSDA 4–9
Jack-In-The-Pulpit (Arisaema Triphyllum) — while the spadix within is said to be the "Jack."<br><br>For cultivation

Perennial

Jack-In-The-Pulpit

Arisaema Triphyllum

Deep ShadeUSDA 4–9
Jacob Cline Bee Balm (Monarda Didyma 'Jacob Cline') — growing up to 4-6 feet in height and 2-3 feet in spread

Perennial

Jacob Cline Bee Balm

Monarda Didyma 'Jacob Cline'

FullUSDA 4–7
Jacob's Ladder (Polemonium 'Stairway To Heaven') — Jacob's Ladder 'Stairway to Heaven' is a herbaceous perennial reaching heights of 12-18 inches

Perennial

Jacob's Ladder

Polemonium 'Stairway To Heaven'

HalfUSDA 3–8
Jacob's Ladder (Polemonium Reptans) — making it suitable for woodland gardens; perennial for half or shade

Perennial

Jacob's Ladder

Polemonium Reptans

HalfUSDA 3–8
Jade Coleus (Coleus 'Jade') — It has a compact and bushy growth habit

Perennial

Jade Coleus

Coleus 'Jade'

HalfUSDA 10–11
Japanese Anemone (Anemone X Hybrida) — the Japanese Anemone thrives in USDA hardiness zones 4 through 8

Perennial

Japanese Anemone

Anemone X Hybrida

FullUSDA 4–8
Japanese Anemone (Anemone Japonica) — Blossoms range in color from pure white to deep pink; saucer-shaped flowers that dance atop slender stems, image 153

Perennial

Japanese Anemone

Anemone Japonica

FullUSDA 5–8
Japanese Iris (Iris Ensata) — also revered as the Japanese Water Iris

Perennial

Japanese Iris

Iris Ensata

HalfUSDA 4–9
Japanese Silver Grass (Miscanthus Sinensis) — Its arching foliage features prominent silver-green blades; rising above the foliage by 1 to 2 feet

Grass

Japanese Silver Grass

Miscanthus Sinensis

FullUSDA 5–9
Japanese Tree Peony (Paeonia Suffruticosa) — red and white flowers in the garden; a focal point of the plant

Perennial

Japanese Tree Peony

Paeonia Suffruticosa

HalfUSDA 4–9
Jerusalem Sage (Phlomis Samia) — lavender to pink flowers that stack in tiers atop square

Perennial

Jerusalem Sage

Phlomis Samia

FullUSDA 8–10
Jethro Tull Tickseed (Coreopsis 'Jethro Tull') — Coreopsis 'Jethro Tull' is a vibrant perennial known for its bright

Perennial

Jethro Tull Tickseed

Coreopsis 'Jethro Tull'

FullUSDA 4–9
Joan Senior Daylily (Hemerocallis 'Joan Senior') — Each flower measures up to 6 inches across, set atop 25-inch scapes

Perennial

Joan Senior Daylily

Hemerocallis 'Joan Senior'

FullUSDA 3–10

Photographs are credited on each plant’s page.