I have three vines in the greenhouse in pots, all growing well but they are not bearing any flower stems at all. This is their second year, and I was told that maybe there is a problem with the soil ph what is the best fertiliser to use to give the vines the right conditions to produce flowers? The varieties I have are Bianca, Rembrandt, and Boskoop glory. Thanks
Growing in pots is possible but it is important to make sure they do not dry out.
More on greenhouse grapes: https://gardenie.wpengine.com/gerrycategory/grapes/?id=5437