Weed and Feed - length of potency

I think it says it's OK as a mulch after 3 or 4 mowings, and OK to compost anyway - but if you leave it 4 mowings after application before using it at all you should be OK

I`d err on the side of caution and not use it at all. Which is more important, your fruit/veg or some free grass cuttings which may or may not be treated with herbicide?

Thanks for your inputs guys - I am going with DavidT on this one as I can't control which cut is 4 or 5 after treatment as this grass would be bagged up by neighbours and I would collect as I pass by en route to other errands.

It is very tempting when I walk the dog to the allotment early morning and see all the bags of green waste awaiting collection, to think how much compost it would all make, but not knowing what chemical nasties are also in there - its just not worth it.

Especially as some herbicides stay stable for many months and will become (relatively) more concentrated as the compost heap rots down in volume.

Council mown grass is a safer bet as it is not treated but i do have to rake up and collect it.  Oh well, I think I knew the answer - I just needed to hear it said back to me.