Left unattended, a vine will spend all it’s energy extending its branches. It will keep going until it literally has no energy left to produce leaves much less fruit. If you find a 20ft grape vine you’ll notice the first few feet may have fruit, then you’ll see leaves, and the end is all stick. A grapevine becomes a stick tree if it’s over extended. If you don’t prune the branch all the way back to it’s fruitfulness, then the vines capacity to produce fruit will be spent only to grow sticks.
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