CrealCritter
Sustainability Master
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Here's another to look at. I didn't study it but part 5 says pruning gapres on an arbor.I've used both those processes, and they rely on horizontal running, which you don't really have with an arch. I guess I'll just have to experiment.
How to Prune Grape Vines: An Easy Guide
Achieve the perfect grape harvest by pruning your vine correctly Grape vines need heavy pruning each year. All heavy pruning should be done while the plants are in a state of dormancy, but additional light pruning may also be needed...
www.wikihow.com
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