I had almost no muscadine grapes. How can I get big yields?

I have a dozen muscadine grapes, all different varieties. This past summer they produced a very large amount of foliage but almost no grapes. I had very few spring blooms. Although I do not prune too closely, I have had grape yields in the past. I use only organic culture... How can I get big yields?

 There are a few things that can contribute to poor muscadine yields. But since you noted that you "do not prune too closely", I expect that's the problem. If you haven't pruned enough in the past, plants will produce a lot of thin, unproductive shoots. I suggest you prune closely this season, leaving only 3 or 4 buds per spur. In addition, reduce the number of spurs.