Good news. I would let your grape vine regrow on the pergola. If it gets too unruly, you can prune it back, but keep a framework of main branches so that it can provide quick shade and greenery in Spring.
Garden overhaul, featuring many unidentifiable plants and weeds
- Thread starter davidinsydney
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They grow at crazy speeds! The grape vine plant is probably 20+ years old. Will it still be viable in producing fruit?
Pruning a grape vine back to the ground is a process of rejuvenation. Grape vines produce best on younger stems, which is all you will have now. You may begin to get good crops as soon as next summer (2022-2023), especially if you continue to prune correctly into the future. Of course, the shade and appearance of a grape arbor may be just as pleasant as the fruit.
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I inherited a grape vine that filled a greenhouse, read up about pruning them and looked at the mass that I removed last year and the short stem left over with some trepidation. It's back in strength this year and bearing plenty of fruit, so keep watering 
Lucky you having a climate that does not need a greenhouse.
Lucky you having a climate that does not need a greenhouse.
Maidenhair Fern Care and Growing Guide
Maidenhair Fern Care and Growing Guide - Brainy Gardener
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