Berberis gagnepainii lanceifolia (= B. gagnepainii) (China)
Habit: Normal shrub, 1.5-2 (3) m tall, up to 1.5 m wide; initially upright, later loosely arching and overhanging, shoots very thorny, slow-growing.
Flowers: Yellow in small panicles, May to June.
Fruits: Blue-black, elongated, 1 cm long.
Leaves: Evergreen, large, lanceolate and wavy, dull dark green, greenish underneath.
Demands: Sun to semi-shade; usually frost hardy, sensitive to frost in extreme areas, even more so on heavy soil.
Soil: Fresh, tolerates moderate droughts, in any well drained garden soil, sensitive to soil compaction; tolerates urban and industrial pollution.
Note: Takes well to cutting.
Hardiness: Zone 7