I have 2 hamburg grape vines planted in a polycarbonate lean-to greenhouse. The rights are inside but in a raised bed 18"high. This is their 2nd season. There was a lot of growth last year. I pruned them back to train then up the wall. I dug in well rotted dung last November. They started to bud frantically 3 weeks ago, I watered them every 2 or 3 days. The other day they both just stopped growing and just froze. I have taken photos each day for a week and there is absolutely no change in size. The leaves have not discoloured it just doing nothing... I appreciate any advice.
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