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Yes it is Charles. I had complete misplaced confidence in the manure from the field next to my garden. I have tried horse manure from several different sources now and all of it has been contaminated with herbicide. I will never use it again, but all is not lost as I had great results with the green compost and chicken manure pellets last year so I will continue mulching with that and I will also have a fair quantity of garden compost ongoing.
I felt my experience was worth posting to warn others using horse manure to always test it before use. I find it extraordinary that all gardening programmes and many magazine articles recommend using horse manure but I have never seen a warning of the risks. I suspect that many gardeners suffer the consequences of herbicide in horse manure and never identify the cause of their problem.