My niece has an enormous outdoor vine which is threatening to take over the whole garden. When should it be pruned and how hard can we do it so that it is manageable next year? The grapes are plentiful but inedible!
The best time to prune is Feb/March and you can prune it as hard as you like. We cut ours back to a stump about 4' high to move and now 4 years later it is 20' long and 10' high with interim pruning.
If the grapes are inedible then get rid of it, make wine or harvest the leaves for stuffed vine leaves - delicious!