Black locust (Robinia pseudoacacia)
Care, watering, light and tips for Black locust on Floravia.
Quick facts
- Family: Fabaceae
- Difficulty: Easy to care for
- Watering: every 7 days
- Light: Full sun
- Temperature: 5–35 °C
- Toxicity: Toxic to pets
About Black locust
Robinia pseudoacacia, commonly known as black locust or false acacia, is a fast-growing deciduous tree native to North America. It is characterized by its deeply furrowed bark, bright green compound leaves, and fragrant hanging clusters of white flowers in spring. It's ideal for urban tree planting, defensive hedges, or as a standalone specimen in large gardens due to its elegant habit and ornamental flowering.
Native range
Southeastern United States
Care tips
It requires full sun for optimal flowering and healthy growth. It is very drought-tolerant once established, so watering should be moderate, especially for young specimens. It adapts to a wide range of soils, even poor ones, as long as they have good drainage; avoid waterlogged soils. A common mistake is planting it in confined spaces, as its root system can be invasive and its branches thorny.
How to save a dying Black locust
- Warning signs
- Yellowish or premature leaf drop, dry or brittle branches, stunted growth.
- First aid
- Check drainage; prune dead branches. If dry, water deeply. If waterlogged, improve soil.
- What kills it
- Constant waterlogging or prolonged drought. It's hardy but dislikes wet feet.
- Can it be saved?
- Yes, often recovers if the cause is corrected promptly. It's a very resilient species.