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Top Questions About Black Walnut Trees

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Questions About Black Walnut Trees

  • Answered by
    Downtoearthdigs on
    June 18, 2019
    A.

    Growing your plants out from under the canopy of the walnut trees would reduce the competition for sunlight and the chance of allelopathic affects from the fallen walnut leaves.

    Because the roots of the trees can extend much farther than the foliar canopy, you may encounter tree root competition for water and nutrients, plus possible allelopathy from the root exudates.

    It may be safer to plant in raised beds. But as you may know, there are other possibilities for wilting of tomato plants. Water deficit would be one; inadequate irrigation, or tree roots competition

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  • Answered by
    GKH_Susan on
    August 11, 2019
    Certified Expert
    A.

    There are several possibilities.
    If the pruning was extreme crown reduction, last year or sometime in the past, with stub cuts that re-sprouted, it is common that the re-sprouted growth is not well attached and will develop structural defects and potential breaking points. There are other reasons for defects:
    major crown reduction - radical topping that exposes the woody stems to sunlight will scald the bark and kill underlying living tissue which progress into wood decay and potential breakage.
    Over burdened branch end-weight is sometimes neglected by tree workers; the end-weight can create susceptibility for breakage.
    Nutrient deficiencies - example: Calcium is important for cell wall strength and therefore structural integrity. Boron is important for Calcium metabolism. These minerals leach from the topsoil with rain and irrigation. Soil fertility is a vital consideration.
    Summer branch break phenomenon. Foliage and wood is at its maximum weight from water uptake in spring and summer. This added weight can predispose the branch to breakage even without defects.
    Here is more:
    https://www.gardeningknowhow.com/ornamental/trees/tgen/dry-brittle-tree-branches.htm

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  • Answered by
    MichiganDot on
    October 16, 2019
    A.

    In good soil, a black walnut lives an average of 150 years but some reach 250. Enjoy your tree.

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  • Answered by
    BushDoctor on
    October 28, 2019
    Certified Expert
    A.

    4 or 5 years is a very long time to be covered. Unfortunately, any damage done will be far too progressed by now to do much about.

    Unfortunately, your photo did not come through, so I can't assess the damage to the tree. Uncovering the tree and leaving it to cure and heal off will be the best bet, though. Covering with anything else after uncovering it could lead to an infection. Letting it heal off will let it build back a hard layer of protection, so long as any damage done is not too far progressed into the tree.

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  • Answered by
    GKH_Susan on
    February 14, 2020
    Certified Expert
    A.

    Here is a good list from Penn State Extension:
    https://extension.psu.edu/landscaping-and-gardening-around-walnuts-and-other-juglone-producing-plants

    Rose of Sharon has a long bloom period. Most of the others have a bloom period in spring or summer but not as long lasting as Rose of Sharon.

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  • Answered by
    BushDoctor on
    February 18, 2020
    Certified Expert
    A.

    Sure! These articles will help:

    https://www.gardeningknowhow.com/edible/nut-trees/pecan/pecan-tree-toxicity.htm

    https://www.gardeningknowhow.com/edible/nut-trees/black-walnut/black-walnut-compatible-plants.htm

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  • Answered by
    BushDoctor on
    May 13, 2020
    Certified Expert
    A.

    There isn't much information on the subject. Juglone appears to have an incredibly high thermo-tolerance. I don't think it would survive burning, but any ash not thoroughly incinerated could harbor some of the herbicide.

    I don't recommend it, but if you do then make sure it is thoroughly burned.

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