Native Habitat:
Moist to dry rocky slopes, open woodlands, forest edges, cliffs, and shaded rocky sites of the Pacific Northwest, particularly western Oregon and Washington. It is well adapted to the Willamette Valley region where it can grow in woodland openings and rocky, well-drained soils.
Bloom Time:
May – July
Growth Habit & Mature Size:
Evergreen to semi-evergreen perennial forming compact basal rosettes, typically 8–16 inches tall and wide. Leaves are rounded to shallowly lobed and often somewhat hairy. Slender flowering stems rise above the foliage, carrying loose sprays of small greenish to yellow-green bell-shaped flowers.
Light & Soil Requirements:
Partial shade to full shade, although it can tolerate morning or filtered sun. Prefers well-drained, rocky or gravelly soils and tolerates summer drought once established. Avoid persistently wet soils around the crown.
Willamette Valley Native Companion Plants:
Tellima grandiflora
Tiarella trifoliata var. trifoliata
Vancouveria hexandra
Viola glabella
Polystichum munitum
Tolmiea menziesii
Urban Garden Function:
A dependable native woodland ground-layer perennial for rock gardens, shaded borders, woodland edges, and naturalistic plantings. Its evergreen foliage provides structure throughout the year, while the delicate flower stems rise above the foliage without overwhelming nearby plants. Its tolerance of dry shade makes it particularly useful beneath established trees where irrigation is limited.
Wildlife Supported:
The small flowers provide pollen and nectar for native bees, especially small solitary bees, as well as syrphid flies, beetles, and other small flower-visiting insects. The foliage provides shelter for spiders, beetles, springtails, and other woodland invertebrates. These insects contribute to the food supply for songbirds and other insect-eating wildlife. The dense basal rosette also creates a cool, protected microhabitat close to the soil surface.
Historical Use:
Heuchera species have been used traditionally by Indigenous peoples in western North America, particularly the roots of some species for medicinal purposes. Traditional uses vary among species and cultures and should not automatically be attributed specifically to H. chlorantha. Today, Green-flowered Alumroot is valued primarily for native woodland restoration, erosion control on rocky slopes, and habitat gardening.
Seed Germination:
Sow seeds on the surface of a fine, well-drained seed-starting mix and press them gently into the surface. Do not cover deeply; the small seeds benefit from exposure to light. Keep the medium consistently moist but not saturated. Cold-moist stratification for approximately 30–60 days can improve germination, particularly with stored seed. After stratification, provide bright indirect light and temperatures around 55–65°F (13–18°C). Germination can be slow and irregular and may take several weeks. Once seedlings develop several true leaves, transplant carefully and keep them evenly moist while establishing.
