BLACK LOCUST

Plant Name: Black Locust
Scientific Name: Robinia pseudoacacia — Black Locust, False Acacia
Mature Height: 40–60 ft
Mature Spread: 20–35 ft
Growth Rate: Fast (2–4 ft/year)
Sun: Full sun
Water: Low to moderate; 5–10 gal per watering while establishing, 2–3 times/week during hot, dry weather; 10–20 gal per watering once established during extended dry periods
Foliage: Feather-like compound leaves with numerous oval, bright green leaflets; deciduous
Fall Color: Yellow
Flower Color: White, fragrant, pea-like flowers
Bloom Time: Late spring to early summer
Fruit: Flat, dark brown seed pods, approximately 2–4 in. long
Hardiness Zones: 3–8 (−40°F to 20°F)
Features: Fast-growing shade tree; fragrant flowers attract pollinators; drought tolerant once established; fixes nitrogen; tolerates poor soils
Additional Facts: Black Locust develops an open, irregular crown and can spread aggressively by root suckers. Its branches may be brittle, and its thorns can make handling difficult. All parts except the flowers are considered toxic if ingested.