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
Hardiness zones - 5 - 10
Height - 10-12' / 3 - 4 m
Spread - 4-8' / 1,20 - 2,40 m
Plant type - Tree
Vegetation type - Decidouos
Exposure - Full Sun, Partial Sun
Growth rate - Fast
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
Germination rate - 78%
Bloom season - Spring, early summer
Leaf / Flower color - Green / Pink
|Germination||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 seed 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 1/8-inch layer of moist sand.
4. Place the pot on a heat mat set at 86F (+30C). At sundown, lower the temperature to 68F (+20C). Raise it to 86F (+30C) in the morning. Continue this until the Robinia seeds germinate in 10 days to five weeks. (source: ehow.com)