I've got a large walnut tree (Juglans regia), and I am happy with it, I just want to improve further that part of my garden to be more attractive to birds and butterflies.

My idea is to plant a climber that will climb up the walnut, and hopefully cover it (at least partially).

I searched the net, but could not find a similar case.

No need to mention that the climber must be juglone-tolerant.

Is this doable, or even possible at all?

My thoughts are now:

  • lonicera
  • hedera
  • wisteria

This list of juglone-tolerant plants mentions lonicera and wisteria, but not hedera. Another list mentions lonicera only (out of these three).

I will be doing some crown lifting pruning of that walnut next spring, so that more sunlight is available daily for the area at the bottom of the tree.

This is not my walnut tree, but my tree is very similar (age, size, habit...) to the pictured one:

enter image description here What do you think?

  • Something wrong in the question. Juglans regia is the common walnut. Black walnut is J. nigra. Nov 9, 2017 at 17:04
  • @GiacomoCatenazzi It is a common walnut, "Juglans regia" is its correct name, I am going to correct the question, THANKS! But, black or common walnut, I believe both emit juglone and have similar habits....
    – VividD
    Nov 9, 2017 at 17:06
  • I live in Europe, and my walnut is a native one, so it can't be Juglans nigra... @GiacomoCatenazzi
    – VividD
    Nov 9, 2017 at 17:54
  • 1
    I note you replaced the link, but they're not relevant; they're about Juglans nigra (black walnut) and worse, they're PDF format, which downloads direct to a person's device hard drive, not read only. Not good - I'm now about to try to find them and delete from my hard drive, very irritating.
    – Bamboo
    Nov 9, 2017 at 23:34
  • 1
    There are no other links to PDFs on this site because they download automatically; but I both create and download PDF documents all the time for other, non GL related reasons. Its the automatic download, without a choice, that's frustrating when linked on sites like these, and your link gave no clue it was to a PDF, or I would not have clicked on it. It is now deleted from my drive.
    – Bamboo
    Nov 10, 2017 at 0:41

1 Answer 1


Note that black walnut (Juglans nigra) has the highest level of juglone in all its parts, so that is a significant difference between it and Juglans regia, the common walnut.

This link https://extension.psu.edu/landscaping-and-gardening-around-walnuts-and-other-juglone-producing-plants has plenty of suggestions for trees and shrubs growing around Walnut, including vines - your lonicera is not on the list of juglone tolerant vines, they are Clematis, Wisteria, Vitis and Parthenocissus quinquifolia. (Note: the link you posted doesn't lead anywhere,so I don't know where you got the information about lonicera being juglone tolerant from. Update - see comment above.)

Note that the text body includes a reference to not using mulch containing walnut leaves; this refers to your other post about composting walnut leaves, so what it's saying is, you shouldn't use as mulch anything containing uncomposted parts from walnut - leaves, once composted, will have lost all their juglone content easily within six months. This difference between composted and uncomposted parts, and failure to understand the difference, might account for all the misinformation about walnut mulch on the web...

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