High Desert Plant Finder & Guide

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Purple Robe Locust

Robinia pseudoacacia 'Purple Robe'

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Purple Robe Locust (Robinia pseudoacacia 'Purple Robe') at Moana Nursery

Purple Robe Locust flowers

Purple Robe Locust flowers

(Photo courtesy of NetPS Plant Finder)

Purple Robe Locust (Robinia pseudoacacia 'Purple Robe') at Moana Nursery

Purple Robe Locust in bloom

Purple Robe Locust in bloom

(Photo courtesy of NetPS Plant Finder)

Height:  40 feet

Spread:  30 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  4

Other Names:  Common Locust

Description:

A round-headed shade tree with highly fragrant and very attractive chains of deep pink flowers in spring; extremely adaptable, performs well in poor soils.

Ornamental Features

Purple Robe Locust has chains of fragrant rose pea-like flowers with yellow eyes hanging below the branches in late spring. It has bluish-green foliage which emerges burgundy in spring. The oval pinnately compound leaves turn yellow in fall. The fruit is not ornamentally significant.

Landscape Attributes

Purple Robe Locust is a deciduous tree with a more or less rounded form. Its relatively fine texture sets it apart from other landscape plants with less refined foliage.

This is a high maintenance tree that will require regular care and upkeep, and is best pruned in late winter once the threat of extreme cold has passed. Deer don't particularly care for this plant and will usually leave it alone in favor of tastier treats. Gardeners should be aware of the following characteristic(s) that may warrant special consideration;

  • Suckering
  • Spiny

Purple Robe Locust is recommended for the following landscape applications;

  • Accent
  • Shade

Planting & Growing

Purple Robe Locust will grow to be about 40 feet tall at maturity, with a spread of 30 feet. It has a low canopy with a typical clearance of 5 feet from the ground, and should not be planted underneath power lines. It grows at a fast rate, and under ideal conditions can be expected to live for 60 years or more.

This tree does best in full sun to partial shade. It is very adaptable to both dry and moist growing conditions, but will not tolerate any standing water. It is not particular as to soil type or pH, and is able to handle environmental salt. It is highly tolerant of urban pollution and will even thrive in inner city environments. Consider applying a thick mulch around the root zone in both summer and winter to conserve soil moisture and protect it in exposed locations or colder microclimates. This is a selection of a native North American species.

 
 
Hardiness Zone Plant Height Minimum Sunlight
Characteristics
Accent  Shade 
Applications
Flowers 
Ornamental Features

Please note: Our Plant Guide is all about plants that will work in the high desert. It is not, nor is it intended to be, a current list of plants in stock on hand at each location or at our farm. We purposely do not sell or ship plants via the internet. Plant questions and availability are best determined in-store.