Just my 2 cents worth here. I live on a farm but have no horses. Cow manure is too strong and will burn plants if not properly aged.
I have grown oncidums in horse poop from my sister's grass fed horses. As an experiment, I grew two identically sized oncidium seedlings, side by side. One in traditional mix and one in straight, fresh horse poop.
The results were amazing! The HP orchid was twice as big and so very luch and green. Just gorgeous!
I didn't get the chance to further experiment as my sister sold her horses. But I did mix some in with my regular bark mixture a catt was growing in.
The results for the catt weren't as spectacular as for the oncidium, but good just the same.
The horse poop doesn't smell after a couple of weeks and I didn't store it in my greenhouse but in a covered bucket outside.
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