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PlantFiles: Small-Flowered Alum Root, Crevice Heuchera, Mountain Saxifrage
Heuchera micrantha

Family: Saxifragaceae (saks-ih-frag-AY-see-ee) (Info)
Genus: Heuchera (HEW-ker-a) (Info)
Species: micrantha (my-KRANTH-uh) (Info)

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18-24 in. (45-60 cm)

24-36 in. (60-90 cm)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Sun to Partial Shade

Bloom Color:
White/Near White

Bloom Time:
Mid Spring
Late Spring/Early Summer


Other details:
Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:

Propagation Methods:
By dividing the rootball

Seed Collecting:
Unknown - Tell us

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No positives
1 neutral
No negatives

Gardeners' Notes:

Neutral ogon On Nov 6, 2011, ogon from Paradise, CA (Zone 9a) wrote:

H. micrantha is endemic to British Columbia, Washington, Oregon, Idaho, and California. It is usually found on mountain-sides and rock outcroppings, but is also occassionally found growing directly in the soil. It can be found in a wide variety of conditions, from arid cliffs in the Central Valley, to the cool, moist coastal bluffs of the Pacific Northwest. In warm climates it does best when grown in shade, but in cooler coastal climates it can also be found growing in full sun. While generally evergreen, it will sometimes die back to the ground in extreme drought or heat, but it will re-appear when the rainy season returns. Flowers range in color from white to red, with white and pink being most common.


This plant has been said to grow in the following regions:

Seward, Alaska
Crestline, California
Paradise, California
Carrollton, Georgia

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