http://www.rosemagazine.com/articles02 ... ckspot.aspSulphur is actually a historical remedy used or hundreds of years by farmers for their crops. It definitely has a place in the chemical-free garden.
Is sulphur not a chemical?
Is sulphur not a chemical?
Found while researching what to do about black spot on roses.
Don't blame me - I voted remain
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Re: Is sulphur not a chemical?
Ah, but it's a natural chemical.