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Are grass clippings with weed killer in compost bad?

tomhumftomhumf Posts: 65
edited May 2021 in Problem solving
I was making a compost heap yesterday with grass clippings - I don't put anything on my grass. My neighbour was cutting their lawn so I asked for their clippings too.

It's just occured to me they might spray weed killer or some lawn treatment. I will ask next time I see them. Just wondering if this would be a problem for compost? Its mixed with a large amount of woodchips and kitchen scraps so would be quite some amount of affected grass anyway.

Compost will be used for vegetable growing. I would test it out by sowing a bean before use anyway. Thanks.

Posts

  • PosyPosy Posts: 3,601
    Bump.
  • Pete.8Pete.8 Posts: 11,340
    I'd imagine it would be ok.
    I recall reading somewhere that so long as treated grass clippings are composted for at least 6 months it should be ok.

    But of course it depends on what chemical your neighbour may or may not have spread on their lawn.
    So to give a more accurate response we'd need to know what if anything was used on the lawn.


    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • KT53KT53 Posts: 9,016
    I wouldn't put the first couple of clippings into compost.  I don't have the bag any more but I think 4 in 1 actually says not to add to the compost heap.
  • FairygirlFairygirl Posts: 55,117
    I don't put clippings in the compost bin for about 6 weeks after any treatment.
    Better safe than sorry, especially if you use it for edibles.
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
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