Frangula purshiana / Rhamnus purshiana
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Size at maturity: 30' tall, 20' wide
- Canopy layer: small tree
- Light requirements: full sun to full shade
- Moisture requirements: moist soil
- Growth rate: slow
- Special features: medicinal, supports hummingbirds
Since Cascara (also known as Chitum) prefers a shady, moist condition, it is often found growing as an understory tree with Vine Maple and Red Alder. The 1/4” black berries, while not especially tasty for humans, are attractive to raccoons and a variety of birds. The bark was used medicinally by Northwest natives and continues to be harvested for its laxative properties. (Portland Plant List, 2016)
Photo Credit 1: Eileen Stark
Photo Credit 2: Tara Lemezis