My greenhouse vine has produced bunches of grapes this year but they have wrinkled and look like raisins! It is cut well back in late autumn each year. I had edible grapes last year but for a few years before that the grapes were covered in mildew. Any advice please. Barbara Woodford
17 Aug, 2012
Hi Barbara I grow a grape outside, about 25years old. I think your grape may be short on water, allowing mildew to attack the leaves. Is the root inside or out side the greenhouse" If inside, as the grape matures, it needs a good supply of water. It gets so warm inside that lots of fluid needed to keep the plant properly hydrated. If you have butt on the greenhouse. You might lead a bit of hose to the base of the grape.
18 Aug, 2012