Black Locust - 'Purple Robe'
Robinia pseudoacacia
Black Locust - 'Purple Robe' (Robinia pseudoacacia) is a tree suited to the Colorado Front Range, rated "Not Recommended" on the 2024 Front Range Tree Recommendation List. It matures to about 30–50 ft tall and 20–35 ft wide, and needs medium water. Black locust suckers prolifically and is on Colorado's watch list as invasive in riparian corridors — better to choose a native alternative.
medium water30–50 ft tall and 20–35 ft wideDeer-resistantToxic to dogs
Photos
At a glance
- Rating
- Not Recommended
- Botanical name
- Robinia pseudoacacia
- Variety / cultivar
- Black Locust - 'Purple Robe'
- Type
- Tree
- Mature size
- 30–50 ft tall and 20–35 ft wide
- Water needs
- medium water
- Colorado native
- No
- Foliage
- Deciduous
- Soil
- clay, loam, sandy
- Soil pH
- 6.0–8.2
- Hail tolerance
- high
- Wind tolerance
- moderate
- Salt tolerance
- high
- Bloom color
- white
- Bloom time
- late spring
- Good for
- slope, south wall
Site factors to consider
- Critical: Insects & Diseases
- Watch: Suckers
- Watch: Re-seeds
Frequently asked questions
- Is Black Locust - 'Purple Robe' good for the Colorado Front Range?
- Yes. Black Locust - 'Purple Robe' is included in the Front Range Plant Finder as a tree suited to Colorado's Front Range, rated "Not Recommended" on the 2024 Front Range Tree Recommendation List.
- How big does Black Locust - 'Purple Robe' get?
- It matures to about 30–50 ft tall and 20–35 ft wide.
- How much water does Black Locust - 'Purple Robe' need?
- It needs medium water once established.
- Is Black Locust - 'Purple Robe' safe for dogs?
- No — Black Locust - 'Purple Robe' is considered toxic to dogs. Keep pets away and check with your vet.
Find Black Locust - 'Purple Robe' near you
See also
Related trees
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Yellowwood — American Yellowwood
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Dogwood — Giant – 'June Snow'
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Honeylocust — Thornless Common – IMPERIAL®, SHADEMASTER®, SKYLINE®
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Poplar (cottonwood) — Narrowleaf
Populus angustifolia