last year I planted a good size Thompson Grape in febuary.It was sad last year . This year . It has done GREAT! till. ??I had 4 to6 bunches starting . YA grapes ! then ??? they ALL dryed up !!?? the plant still lookes great . what happened ???
If it grew poorly last year it probably wasn't big enough to support a crop this year. If it grows well this year you could leave a moderate crop next year. But you'd do well to learn how to properly prune next winter and thin the clusters next spring.