Is there any reason to avoid putting flowers purchased from the florist in compost?
The flowers were gifts but are now wilting. Would florists or growers use anything on the flowers to preserve them that might be bad for compost?
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The only reason not to that I can think of is that commercially produced flowers can have a lot of pesticide residue. Some of these chemicals may break down during composting. And unless you're adding a large amount of flowers to your compost pile (in terms of the ratio to other material) it will be diluted greatly by the rest of your compost feedstock. So it seems unlikely to me that it would cause a problem with the end product, but if you want to be absolutely safe, add the flowers to a compost pile that you won't use on edibles.