General Culture:
Grow in average, dry to medium moisture, well-drained soil in full sun. Prefers organically rich soils, but tolerates poor, dry soils.
Noteworthy Characteristics:
Rose locust (or rose acacia) is a showy-flowering, deciduous shrub which typically grows variably from 2-10' tall. In the wild, it can aggressively spread by suckering, but in cultivation, nurseries often graft it to the roots of R. pseudoacacia (black locust) which results in a much less aggressive plant. May be trained or topgrafted to form a small tree. Rose to pale purple flowers appear in 2-4" long, pendulous racemes in May. Compound pinnate, medium to dark green foliage (7-15 leaflets). Flowers are infrequently followed by bristly, purple seed pods (to 3" long). Branches, petioles, flower stalks and fruits are hispid (stiffly hairy) as the species name suggests, thus giving rise to another common name of bristly locust. Steyermark lists this southeastern U.S. native as a garden escape in Platte and Howell counties in Missouri.
Problems:
Borers can be a significant problem. Leaf spot, powdery mildew, canker, scale and leaf miner are lesser potential problems. Branches are susceptible to damage from heavy winter snows and ice storms.
Uses:
Excellent flowers and foliage. Specimen or screen. Good plant for stabilizing embankments and slopes and for planting in poor, dry soils. Interesting informal hedge.
© Missouri Botanical
Garden, 2001-2009
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