It's difficult to see the vines but these 2 Marquis grapes were planted 2 years ago. I would like to train them to grow on the trellis wires (4 strand) that are 7 foot above the ground. I have not done any prunning yet. Should I remove branches/runners at this point or continue to let them reach the wires? They did have 4 or 5 bunches of grapes last year that were excellent eating grapes.