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I find most gardeners to be very generous with cuttings, seeds, advise...you are right...asking is the best thing to do.I had not given it much...
In re-reading the original post, I see your point...I thought they found it on a pile of discarded material..which would have been fair game...But...
Sounds like a "rescue" to me !!
I use Ortho for Black Spot and systemic Insects...works good...