- Mature Height: 40'
- Mature Width: 30'
- Light Requirements: Full sun to part shade
- Water Requirements: Average to low once established
- Hardiness Zones: 4, 5, 6, 7, 8
There are few blooming trees more impressive than black locust trees. Robinia ‘Purple Robe’ produces huge clusters of purple to pink flowers in early summer. The blooms offer a delightful fragrance through the season. Once blooming has finished, smooth, rounded seedpods take their place. New spring foliage emerges a red-purple color. The dark green mature leaves reach 10-inches in length and offer up beautiful golden fall color. Plants grow moderately fast with a compact, rounded shape. While considered a good urban tree due to its relatively compact size, you’ll still need to take care when planting near power lines. Trees can grow up to 40-feet tall so you’ll still need to plant them set back from overhead wires. Plants also spread by root suckers that will need to be kept trimmed back to the ground. The suckers can become a maintenance issue over time if not managed properly. Plants also have thorns. Tolerates a variety of soils, including heavy clay, and will tolerate some shade.View Availability