Soil and Compost forum→Composting Grass Treated With Weed and Feed Selective Herbicide

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matt4317
Apr 5, 2021 10:28 PM CST
I'm wondering how long I should wait to compost lawn clippings after treating my lawn with a selective herbicide for broadleaf weeds.

I applied Scotts Weed Feed and Greenup to my lawn in late December, which is the height of summer here in Australia. Just over 3 months have passed and I guess I've mowed it around 6 times since then.

The active ingredients in the herbicide are Dicamba and MCPA.

I've just bought a compost tumbler and didn't really think about it until now.


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Name: Sally
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sallyg
Apr 6, 2021 5:45 AM CST
I hope someone can cite a good source.
I am not that cautious in general but in this case, I'd just let clippings lay on the lawn as I always do anyway.

However, if your lawn is sprouting broadleaf weeds now, one might say the herbicide must have broken down. There are probably a lot of variables but seeing broadleaf plants grow in that area seems to me the best test.
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Name: Larry
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Seedfork
Apr 6, 2021 6:34 AM CST
@Matt4317
Welcome!
I seldom use Weed and Feed, and my lawn shows it, it is just loaded with weeds. But, I do pick up lawn clippings from around the neighborhood and compost them. However, I only use the compost around my flowers.
Here is a very short paragraph( article) suggesting how long before using the clippings if you are using them around food crops as well as flowers.
https://extension.oregonstate....
Name: Thomas Mitchell
Central Ohio (Zone 6a)
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thommesM
Apr 9, 2021 2:54 PM CST
@Seedfork thanks for posting that article.
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