I haave about 6 plants growing beneanth a bamboo trellis and the grapes are growing up the sides of the bamboo. I trained the vines to twist around it. I have 4 bamboo poles from ground up with bamboo across the top. I have 1 plant that has so many shoots coming off the main plant . I have been twisting them around the top post. I was wondering if this is too many vines as I have a big tangle of vines. Should I cut some of the vines or leave them?.