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PlantFiles: Cascara, Pursh's Buckthorn, Cascara Sagrada, Bearberry
Frangula purshiana

Family: Rhamnaceae
Genus: Frangula (FRANG-yoo-luh) (Info)
Species: purshiana (pur-shee-AH-nuh) (Info)

Synonym:Rhamnus purshiana

One vendor has this plant for sale.

2 members have or want this plant for trade.


20-30 ft. (6-9 m)

20-30 ft. (6-9 m)

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)

Sun Exposure:
Sun to Partial Shade

All parts of plant are poisonous if ingested

Bloom Color:
Chartreuse (Yellow-Green)

Bloom Time:
Late Spring/Early Summer

Grown for foliage

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

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

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By cranberry
Thumbnail #1 of Frangula purshiana by cranberry

By growin
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No positives
1 neutral
No negatives

Gardeners' Notes:

Neutral Sis On Oct 5, 2001, Sis wrote:

Cascara sagrada means"sacred bark". It yields an extract that is an active ingredient in several commercial laxatives,for both people and their pets.

Harvesting/Storing: In spring and fall,strip bark from wood. Dry well before storing.

Precautions: The bark must be aged for at least 1 year before use. Infusions made from fresh bark tend to cause intestinal cramping.

Other common names:Bearberry.


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

Seattle, Washington
Stanwood, Washington

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