Planting, Growing, And Harvesting Grapes - The Old Farmer's Almanac

• Do not fertilize in the first year unless you have problem soil. Fertilize lightly in the second year of growth.
• Use mulch to keep an even amount of moisture around the vines.
• A mesh net is useful in keeping birds away from budding fruit.

Pruning Grapes

Pruning is very important. Grapes produce fruit on shoots growing off of one-year-old canes. If you have too many old canes (from no pruning), then you’ll get fewer grapes. If you prune back your vines completely each year, then you get lots of new growth, but again, few grapes.

Pruning is done in late winter when the plant is dormant, usually around March. But for the first year or so, the goal is to create a strong root system and trunk. Plant in spring and prune back the grapevine to three buds. Then wait until the first winter.

• If you are growing grapes on an arbor or trellis: Grow the grapes, one per post, selecting the strongest cane. Allow it to grow to the top of the post the first year, securing it to the post as it grows. The first winter, top the cane and allow it to grow side branches along the top of the arbor. If you let the vines just continue to grow, they will produce dense shade, but little fruit. Prune the grapes each winter by removing those canes that fruited the previous year, cutting back one-year-old canes to five to six buds, and leaving some renewal canes pruned back to two to three buds. The goal is to have canes on the trellis spaced 2 to 3 feet apart. Remove any weak, thin canes. You want to leave enough fruiting canes on the trellis to fill it back in each summer, but not so many that it becomes a tangled mess.
• If you are growing grapes on a stake, cut back the side canes in the first winter to three buds on each. These will send out shoots that will produce grapes the next year. Remove all weak and spindly growth, especially along the lower parts of the trunk. The second winter, prune back the healthiest canes to six to ten buds, select two canes as renewal spurs, and prune those back to three buds on each and remove all other canes. Repeat this pruning each winter. Your trunk should be able to support four to seven fruiting canes each year as it gets older.