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Weed killer under shrubs?

Discussion in 'Homeowner Assistance Forum' started by whitenack, Apr 5, 2006.

  1. whitenack

    whitenack LawnSite Member
    Posts: 78

    Last weekend I put down some mulch in a large section of the yard. I did my best to get most of the weeds out before I put the mulch down, but getting them all was impossible.

    Already, I have dandelions and other little weeds poking their heads through the mulch.

    In the area, I have young boxwoods and barberries, so I am worried about their health.

    Are there any weed killers that are safe for those shrubs but will kill weeds and grasses? What about spraying under trees?

  2. NEPSJay

    NEPSJay LawnSite Senior Member
    Posts: 492

    "Preen", you can get it anywhere.... walmart, home depot, lowes, etc etc
  3. upidstay

    upidstay LawnSite Bronze Member
    from CT
    Posts: 1,341

    Preen is a good pre-emergant (will prevent seeds from sprouting), but will do zippo for existing weed plants. Round up is ok for under shrubs. Just DO NOT GET IT ON THE LEAVES OF THE SHRUBS. If you do goof, wash it off immediately.
  4. Critical Care

    Critical Care LawnSite Bronze Member
    Posts: 1,654

    A careful post emergence application of glyphosate, such as Roundup, shouldn't hurt the shrubs - normally. But like upidstay said, don't get it on the foliage. A chemical "drench" could also harm the shrubs, so don't get carried away, but instead try spraying just leaves of the weeds and nothing else. Don't do it on a windy day.

    It isn't that uncommon to see trees bordering agricultural fields suffering from herbicide drift, or in ground poisoning.
  5. sheshovel

    sheshovel LawnSite Fanatic
    Posts: 5,112

    You need to put your mulch down thicker..if the weeds cant get light..they can't grow.

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