| Scientific Name: | Berberis x gladwynensis 'William Penn' |
| Common Name: | William Penn barberry |
| Family Name: | Berberidaceae |
| Origin: | Garden origin |
| Hardiness Zone: | Zone 5: (-29 to -23 °C) |
| Plant Type: | Broadleaf evergreen |
| Mature Size: | 0.7 - 1.3m x 1.0 - 1.5m (height x width) |
| Habit: | Arching, Dense, Twiggy, Upright |
| Form: | Mounded, Oval - horizontal |
| Texture: | Medium |
| Landscape Uses: | Attract birds, Fall interest, Filler, Hedge row, Mixed shrub border, Security/barrier, Sheared hedge, Specimen plant, Spring interest, Winter interest |
| Exposure: | Full sun, Part sun/part shade |
| Soil or Media: | Rocky or gravelly or dry, Well-drained |
| Leaves: | Simple, Whorled, Leathery, Glabrous, Lustrous, Elliptic, Spinose |
| Flowers: | Flowers clustered, Yellow, Apr-May |
| Fruit: | Berry (true), Purple, Black, Sep-Oct, (Persistent) |
| Key ID Features: | |
| Evergreen spiny shrub to 1.3m tall, branches somewhat arching, mound forming habit; leaves whorled, most blade elliptical, sometimes of differing sizes up to 2-5(-7)cm long x 1.5-2.7cm wide, dark green, turning bronze-red in fall-winter; margins spiny with 3-9 points per side; three-pointed, spiny stipule per node with each point 15-20(-27mm) long (<a href ="https://www.google.com/search?q=%22Berberis+julianae%22+spines" target="_blank">B. julianae</a> may have even longer spines). | |