Robinia pseudoacacia 'Purple Robe'

Purple Robe Black Locust

Purple Robe black locust has dark purple flower clusters and new leaves tinted purple before maturing toward bronze-green. Its fast-growing, open framework supplies summer shade in suitable warm, dry climates.

The canopy loses its leaves for winter. Autumn color includes yellow. Allow the natural framework to develop without crowding neighboring plants or paths.

Choose a sunny position with well-drained soil. Water during establishment and allow enough room for the developing crown.

Size guide
• Height: About 50 ft
• Width: About 32 ft
These are the grower’s landscape estimates; local conditions and age affect actual size.

Hardiness
• Published minimum: USDA Zone 3
Upper climate limit is not specified in this cultivar reference.
The grower provides whole-zone ratings; an A/B limit has not been verified.

Best Uses
• Flowering specimen
• Open lawn accent
• Seasonal mixed planting

Plant type

Deciduous Tree, Flowering Ornamental Tree

Height

50 ft

Width

32 ft

Hardiness zones

3–8

Sunlight

Full Sun

Growth rate

Fast

Bloom time

Spring

Flower color

Purple

Leaf color

Bronze, Green, Purple

Fall color

Yellow

Soil

Moist well-drained

Landscape use

Provide Shade, Specimen

Shape

Arching, Open Canopy

Fruit

Yes

Fragrant

No

Deer resistant

Yes

Salt tolerant

No

Drought tolerant

Yes