More About The Purple Robe Black Locust

A while back I wrote about the Purple Robe Black Locust trees we had planted and how I thought that they were pretty great trees at first but as of late was having serious doubts about them after I noticed they did not hold up very well in storms.

We recently had to replace one of the Purple Robe in a row along one of the driveways. The landscaper planted the tree and I checked the tag to be sure even though it was not quite the same as the others. Different shape and size. Well the administration was convinced that this was not the right tree and they insisted that the landscaper planted the wrong tree. Had I not seen the tag with my own eyes I would have believed the administration. I did see it though yet this tree was definitely not the same as the others. So I started to do some research. I now have a real dilemma on my hands!

This is a picture of a tree that looks just like what was planted..width=

This is a picture of a tree that looks just like what was planted. I downloaded.

“Photo by Tom Grier/Winona State University; used with permission.”

As you can see the shape of this tree and even the purple pink flower brackets hanging down . It is very lovely tree. The only problem is that the purple robe black locust we had planted did not look like this. So now I had to go on a search to find out what we had planted. This is what I came up with.

This is a picture of the tree we have palnted that I downloaded.

This is a picture of the tree we have palnted that I downloaded.

This is not a Purple Robe Black Locust it is a Robinia pseudoacacia Umbraculifera which is also a varety of black locust. I calle the nursery that sold us these tree 3 years ago and they confirmed that they had sold us the wrong trees but there was not much we could do about it as 3 years had passed.

So just to make matters worse growers are not growing this tree right now because it was found to be very suspetible to borer attack and when it was under stress it tended to sucker from it’s root sending up shoots of the root stock it was grafted to. Which is a very invasive tree that also tends to be filled with thorns. Well I decided better to start looking at all 55 of these trees and after just a couple of them I just stopped. I found that they were starting to sucker and then I checked the tres and found they were covered with borer holes and well now I guess it is time to make a decision. I have presented this to the administration and I await there decision.

These trees were all checked by the Landscape Architect that had drawn this plan ever one of the 460 trees we had planted were field checked by her. So if the person that designed this did not know what the tree looked like well I am just saying! My thought as each of these trees dies out lets replace them with the right tree. We will See

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More About The Purple Robe Black Locust — 3 Comments

  1. Our purple lobe black just split in two down to the trunk where the tree was grafted. I was wondering if the limb can be reattached in any way since it is a grafted tree. Also, is this tree known as a tree that is not very strong. There was no storm, just strong winds today.

  2. Glenns Garden,

    I cam across this page today. Very informative.

    I’m informing you that the Purple Robed Black Locust photo you have on this page is a copyright image, shot be me, which originally appeared in the book “The Trees of Winona State University.” The image can only be used with permission, and if appropriate credit is given.

    Here’s the location of the original image:

    Copyright © by Winona State University
    P.O. Box 5838
    Winona, Minnesota 55987

    All rights reserved. This book may not be reproduced, in whole or in part, including illustrations, in any form without permission from Winona State University.

    ISBN 0-9704544-2-2

    I’d be willing to grant permission, if you’ll include a credit line adjacent to the image that reads: “Photo by Tom Grier/Winona State University; used with permission.”

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