New in our assortment | Robinia ‘Purple Robe’

A promising tree, suitable for a variety of situations. In this blog, more details about its origins, growing site preferences and uses.

Features

Robinia ‘Purple Robe’ resulted from a cross by William Silva in 1964 between R. ambigua ‘Decaisneana’ and R. hispida ‘Monument’. These two species characterize a more compact growth than the Common or Shamacacia (R. pseudoacacia). This is then also seen in Robinia ‘Purple Robe’.

Robinia ‘Purple Robe is a fast grower but, with a height ranging between 9 and 15 feet, remains smaller than the Schijnacacia.

The leaves appear somewhat later in spring and are initially bronze-green in color. The rest of the season the leaves are a deep green color, another trait it inherited from its
ancestors. In autumn, the leaves turn to a somewhat duller yellow.

The compound foliage creates a semi-transparent crown, allowing undergrowth. The fairly vertical branch position creates an upright round crown. The crown of older specimens have a whimsical
character.

In late spring, Robinia ‘Purple Robe’ blooms with fragrant hanging clusters of purple-pink flowers up to 20 centimeters long. These are very popular with bees thanks to their high nectar production. A valuable gestation plant that blooms after the April/May mass blooms.

Growth site

In terms of soil type, this ‘Purple Robe’ is not very demanding, if prefers loamy moist well-drained soil. 

A position in full sun or partial shade is suitable. 

Dry conditions, as well as temporary wet conditions, this cultivar tolerates extremely well. Standing water, on the other hand, should be avoided. Robinia ‘Purple Robe’ prefers to grow in wide greenbelts or parks. 

In dense pavement, roots can push up the pavement. Air pollution and moderate winds are not a problem for this tree. 

Application

Pioneer for poor soils

Robinia is a tree in the Butterflyflower family. Trees and plants in this family can take up nitrogen from the air through the leaves and store it in nitrogen root nodules. As a result, this tree can also be grown on poor
soils grow. This pioneer is great for use in young stages of a food forest. Thanks to its vigor and nitrogen-fixing properties , this species provides shade to the growing shrub and herb layer. The sheet is
great for use as mulch for soil improvement.

Wadis

Because of resistance to drought and tolerance of temporary wet feet, this species is of interest for application in urban area and near wadis. Planting at the bottom of a wadi is not recommended. The opportunity
on stagnant water is too great at that growing site. 

Green strips and semi-paving

Robinia ‘Purple Robe’ tends to make root sprouts . Especially when roots are damaged, this is a known reaction of this species. We therefore recommend planting this species in wide
green spaces or parks. Semi-paving is also an option. Growing sites close to underground utility lines are less suitable, as there is a high chance that work will hit the roots.

In the city

In cities, trees tend to grow under more extreme conditions. Shading from tall buildings, heat and drought in the summer make more demands on the tree. Robinia ‘Purple Robe’ tolerates these conditions. The ascending branch position makes the crown suitable for street profiles, traffic can effortlessly pass under it. The transparency and blooms add to the streetscape without making the street feel smaller or darker. 

Interested?

After reading this blog, are you interested in applying Robinia ‘Purple Robe’ in one of your greenery projects? Contact one of our account managers and ask about availability. Various sizes and qualities are currently growing in our nursery.