Have you ever used a aspirin for fertilizer?
Certified GKH Gardening Expert
Salicylic acid, part of the active ingredient compound in asprin, is a naturally occuring plant hormone. It is not usually considered a fertilizer by itself, but it is contained in some stress reduction fertilizer products, like Recover Rx (3-18-18) from Growth Products company.
I've never heard of anyone applying aspirin as a fertilizer.