Non-organic horse manure

Question ...

I'd like to use some horse manure that is available locally, but I am worried that it might be contaminated by veterinary treatments used on the horses. Is there any information about how long it is necessary to wait before I can use it?

Answer ...

Farmyard and horse manures from non-organic sources can be used in organic gardens after being aerobically composted for three months, or stockpiled under cover for six months.

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