Botanical Name: Robinia ambigua 'Purple Robe'
Common Name: Purple Robe robinia
Type of Plant: dicot: tree
Character deciduous
 
Habit of Growth:
Overall Shape an upright, mostly single-trunked tree; primary branches form a vase-shaped structure – ascending and spreading branches form a loose open rounded canopy; branches armed with short spines
Height 25' - 40'
Spread equal
Growth Rate rapid
 
Environment:
Exposure outdoors prefers full sun and heat; tolerates some shade at inland sites
Soil tolerates most, including desert soils with alkaline pH
Hardiness hardy (zones 1-24): thrives in zones with cold winters
 
Morphology:
Leaves odd-pinnately compound with 13-23 leaflets, 10"-16" long, alternate; leaflets 1 1/2"-2" long, oval-narrowly ovate, medium green above, pale green beneath, with mucronate apex
Flowers dark lavender pink-purple, sweet pea shaped, in showy 8"- 10" long clusters arising from new stem growth; March-April
Fruit a pod - 2"-3" long
 
Propagation:
hardwood cuttings or budding/grafting
 
Usage:
a medium-sized accent tree for its showy display of purple flowers in spring, followed by filtered shade and its loose graceful form; excellent for sub-tropical, Mediterranean & temperate climate theme gardens; useful as street or lawn tree
 
Landscape Care:
Watering prefers occasional deep-soak watering; is quite drought-tolerant after established
Fertilizing little required
Pruning develop wide-spreading framework when young; can be headed back to control height; thin out as needed; remove suckers
Pests/Diseases relatively free
Special Conditions/Other
 
Origin: natural hybrid of R. pseudoacacia and R. viscosa
Family: Fabaceae

Notes:
 
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