Does pre-emergent hurt trees?

Old 05-15-06, 11:55 AM
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Question Does pre-emergent hurt trees?

Does pre-emergent hurt trees? Among the trees on our property is oak, maple and pear. I want to put a landscape fabric around the base, cover it in decomposed granite, and then just spray it once a year with pre-emergent, as long as it doesn't hurt any of the trees. Is this what they do in parks?

Otherwise, can you help me think of any alternatives?

Thanks in advance,
Old 05-15-06, 12:06 PM
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always read the labels, but when used at labeled rates we have never had a problem with commonly used pre emergents. all herbicides have some root pruning tendencies so dont over apply.
the organic followers will probably disagree with my comments.
Old 05-18-06, 11:59 AM
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Hi A4B4,

I would be more concerned with the decomposed granite you plan on putting over those tree roots. I feel you are asking for trouble with your trees. Tree roots need oxygen and don't do well over time with added weight and compaction of the soil over their roots. You should find this an interesting read.

Why not go with an organic mulch that will decompose and add microbes to the soil to improve the health of your trees? If pulling weeds is a problem consider a weed hound.

How to mulch trees:

I also wouldn't bother with the landscape fabric or weed cloth. Most weeds will sprout from seeds deposited by the wind. They land on the surface of the soil, mulches, etc and sprout. If you have something like decomposed granite on top of the roots, they won't be able to sprout since it forms a barrier, but the granite will eventually be deadly to your trees. If you use gravel or stones, bits of soil will be blown in between the stones, and weeds will still sprout from above. If you want more advice about putting decomposed granite on top of your tree roots, I can give you links to a couple of forums where certified arborists answer questions.


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