A decidious Shrub growing to 2m at a medium rate.
It is hardy to zone 5. It is in flower from May to June. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects. It can fix Nitrogen.
Robinia is the botanical name for a group of trees and shrubs commonly known as locusts. Eight varieties of Robinia are native to North America, with black locust the most commonly cultivated and the most valued for its wood. The Robinia genus is in the bean family (Leguminosae), members of which typically fix nitrogen in the soil. Robinia seeds have a tough, outer seed coat that requires scarification to break its dormancy. Begin the process in late winter. (source: ehow.com)
Genus - Robinia
Species - Fertilis
Common name - Bristly Locust
Pre-Treatment - Not-required
Plant type - Tree
Vegetation type - Decidouos
Hardiness zones - 5 - 10
Exposure - Full Sun, Partial Sun
Height - 10-12' / 3 - 4 m
Spread - 4-8' / 1,20 - 2,40 m
Growth rate - Fast
Bloom season - Spring, early summer
Leaf / Flower color - Green / Pink
Soil PH - Acidic, Neutral, Alkaline
Soil type - Clay, laom, Sand, well drained
Water requirements - Average Water, drought tolerant
Landscape uses - Feature Plant, Shade Trees, Street Trees
1. Use a pair of baby nail clippers to pinch off a piece of each Robinia seed's outer seed coat. Don't cut too deep — just enough to allow water to penetrate to the embryo.
2. Heat water until it is hot to the touch and pour it into a shallow bowl. Place the Robinias seeds in the water and let them soak for 48 hours. They should swell during this period. If they don't, cut the seed coats again and repeat the hot water soak.
3. Fill a small nursery pot with sand and set the Robinia seeds on the surface. Cover it with a 3 mm (1/8") layer of moist sand.
4. Place the pot on a heat mat set at +30C (86F). At sundown, lower the temperature to +20C (68F). Raise it to +30C (86F) in the morning. Continue this until the Robinia seeds germinate in 10 days to five weeks. (source: ehow.com)