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PB PM
Sneaky Punk
 
Join Date: Oct 2005
Location: Vancouver, BC
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2021-05-08, 10:00

Yes, heavy pruning of grape vines during late winter/early spring will provide the best growth and fruiting. Most of what you see in peoples yards are ornamental grape vines, but the practice is similar to keep them looking good. The best results really depend on the weather, if it is really wet when the plant is flowering, you won't get a lot of grapes, since just as any fruit tree, they need pollinators. Putting some perennials or annuals that are highly attractive to pollinators near it will be very helpful (Echinacea, Cat Mint, English Lavender, Salvia, Marigolds, and Zinnia are usually a good bet). Some of those will need deadheading to keep flowering, but if you want grapes, it will be worth it. Luckily grapes hide their flowers under the leaves for the most part (my experience anyway), which means if the bees and other pollinators hide in it on wet days, they might still work on them. Once established in the ground they are extremely aggressive growers, pots really limit what they will produce, and need pruning throughout the growing season if appearance matters at all to you. It's not hard to avoid pruning the fruiting parts of the plants once you know what to look for.
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