If cane growth is 3 feet or less in a year, additional nitrogen should be applied. Apply fertilizer 6 to 12 inches from the trunk. Extend the area of application outward as plants mature. High nitrogen fertilization promotes heavy vine production at the expense of fruit production. Avoid nitrogen fertilization late in the season.
Late fertilization interferes with proper hardening off going into winter.
Remove vegetation within 1 to 2 feet from the trunk by shallow cultivation. Two to 4 inches of mulch, plastic or landscape fabric will conserve moisture and suppress weeds. Proper pruning increases quality and quantity of the current year's crop. It also improves vine health, ensuring good production year after year. Pruning keeps vines at a manageable size for the trellis and maximizes exposure to sunlight.