Last year we skipped several vines that had no fruit when we were havesting the West Catawba. This year we noticed several vines with no clusters. We did have some Chambourcin vines that did not have clusters either and we found that they were propagated from the same vine (which had been removed so we were not sure if it was fruitless or not). Anyway, we are tagging these vines as we shoot thin so we can see if they are fruitless again next year. If so, we will plan to replace them.