Pollinator at English Wikipedia · CC BY-SA 3.0
Black locust
Tree·Robinia pseudoacacia
Full sun
Sun
Low
Water
Well-drained soil
Drainage
Zones 4–9
Hardiness
Black locust (Robinia pseudoacacia) is a tree. It grows best in full sun and has low water needs. It grows well with black walnut, heartnut and english walnut.
Through the year
DormantLeafing outFloweringFruiting
Works well with
from wiki dataWHAT IT NEEDS
Wants full sun
Needs little water
Needs well-drained soil
Prefers soil pH 5.5–6.5
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Prefers sandy, loamy, clay soil
Tolerates compacted soil well
Fixes nitrogen in the soil
Draws up nitrogen from deep in the soil
Adds a lot of organic matter to the soil
Partners with mycorrhizal fungi to boost nutrient uptake
WHAT IT GIVES
Gives mulch biomass (high)
Gives shade (medium to high)
Provides nitrogen
Attracts pollinators
HOW IT GROWS
SIZE & SPACING
Canopy tree
Height1200–2500 cm
Spacing1000 cm (min 500 cm)
Root depthDeep
Width600–1500 cm
Width figures are rough estimates, the most variable measurement in our data.
AI estimate · accuracy improves as growers contribute corrections.
HOW TO PROPAGATE
Propagate by seed, cuttings, suckers
Difficulty
Establishes in about 2 yr
Self-seeds freely and can spread on its own
Where this comes from
Parsed11 Sept 2026
ConfidenceNot recorded
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