Robinia umbraculifera
Umbraculifera black locust · also Black locust
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Robinia umbraculifera is a deciduous tree, a cultivar of black locust, distinguished by its dense, rounded crown, often grafted for a formal "lollipop" appearance. It exhibits a fast growth rate and is adaptable to poor, well-drained, and sandy soils, becoming drought tolerant once established. However, it can aggressively sucker from the rootstock and its sharp thorns pose a hazard. Flowers are usually absent or greatly reduced in this cultivar.
Where it grows
Trees in each city's inventory, with the share of that city's named trees this species accounts for.
- 220.01%—3.8 in
No city in this list records planting dates for this species, so age is blank throughout.
Traits
- Form
- Broadleaf
- Foliage
- Deciduous
- Mature height
- 20 ft
- Canopy spread
- 40 ft
- Growth rate
- Fast
- Soil
- Sandy, Well-drained
- Water needs
- Low
- Drought tolerance
- High
- Roots
- Invasive
- Wildlife value
- Low
Trunk diameters across every city: median 3.8 in, mean 3.4 in, 90th percentile 3.8 in. Measured at breast height, as published by each inventory.
Other Robinia in the catalogue
7 of the top 2,000 species are in this genus.
