Mix some (2 inches or so) in with soil and plant a seedling in it to see if it burns.. Normally I'd say at a year you're good to go but I see that you live in Ottawa and I'd imagine the manure was frozen solid all winter? If that's the case, then it's very likely that it isn't fully decomposed..
Last edited by Mike723; May 13, 2016 at 04:31 PM.
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