Pruning a Greenhouse Grape

General Fruit Growing
1

So it’s time, maybe past time, to prune the Concord grape I have been growing in the GH (buds are swelling). It’s 2 y.o. and has made it up roughly 9’ and is starting to branch sideways on the wire up there, 8’ one way and 4’ or so the other.

I’ve read the various grape pruning guides, and have a rough idea of how one should go about this, at least for outside vines. But did not see anything specific to vines being grown in a GH.

I ask a similar question last year, and followed @fruitnut advise then which got it up as tall as it is. Just wondering if any of it changes now that this vine is a year older and up higher. Anything I should know before I start cutting?

2

I cut mine back to a single cane running each way. Depending on how much space it has to expand into maybe 3-4ft each way. Then I shorten clusters if needed and thin out the clusters to what seems right.