I bought the book from Ison’s nursery on growing Muscadine grapes and according to the book Muscadine grapes are suppose to be within a certain ph range or you will see reduced yields and potentially plant damage. I am traveling now for work so I can’t check the PH range but I think the book stated anything over 7.2 ph could kill the plant. Let me verify when I get home tomorrow. Its good to know yours are growing at 7 - my soil usually runs 6.7 to 7. I put down enough acidifier to hopefully bring it down to 6.2 to 6.5 range.
1 Like