Bower
These containers are just a few of many I have. All have copious amounts of horse manure. Most have been out for 3 plus weeks in the crappiest May weather I can remember. Generally wet and very cool. If there was a problem with the mix you would see it. These plants will explode with growth by the 2nd week of June.
I believe the problems associated with using horse manure in a mix is not the age of the manure but rather the other components of the mix. You should be able to put a strong stream of water on the mix with no pooling whatsoever. If you can't, your mix is too heavy.
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