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  • Answered by
    DLarum on
    July 9, 2017
    Certified Expert
  • Answered by
    Downtoearthdigs on
    July 15, 2017
    A.

    Most herbicides will kill anything it touches.

    Avoid overspray onto your plants.

    https://www.gardeningknowhow.com/plant-problems/weeds/glyphosate-information.htm

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  • Answered by
    MichiganDot on
    July 17, 2017
    A.

    It is a tough plant. I'd do it now and start at the bottom. Remove the oldest/fattest/worst thorny stems to the ground. Remove dead wood and branches that rub against each other or lean all the way across the plant then reduce the height to what you desire. Pruning stimulates new growth and if done late in the growing season, it will produce growth that doesn't have time to harden off before winter. Winter kill of the new growth invites disease.

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  • Answered by
    Downtoearthdigs on
    July 30, 2017
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  • Answered by
    Downtoearthdigs on
    August 12, 2017
    A.

    A soil test will help you determine if you need to amend the existing soil.
    Your County Extension Office can help with a soil test for just a few dollars.
    https://www.gardeningknowhow.com/extension-search/
    https://www.gardeningknowhow.com/ornamental/shrubs/barberry/barberry-shrub-care-tips.htm
    https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improving-garden-soil.htm

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  • Answered by
    MichiganDot on
    August 6, 2017
    A.

    There is a difference between pruning and trimming. Trimming is fine in July and August to control height. Pruning removes thick old canes and crossing branches to shape the overall plant and keep it vigorous. Prune in spring after blooming, or before it blooms if they aren't important to you. Any time you find dead or diseased branches, you should remove those promptly regardless of time of year.

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