I have suffered powdery mildew for the last three seasons (Black Hamburg)
but believe that I have now found a remedy.
Before launching into the preparations for the next season, a question. I
have read although never practised it , that next season's grapes grow on
last seasons growth. Last season's growths are on the previous season's
growths, and this could go on forever.
Have I misunderstood?
Alistair