When I arrived at the farm on Deer Field Road in Mount Pleasant, PA
that Sand Hill Berries and Greendance – The Winery at Sand Hill both call home, the windchill was hovering near O° and a thin layer of snow covered the ground. Rick Lynn had invited me to his vineyard to show me how he uses the VPS (Vertical Shoot Pruning) technique to prune his Marquette vines. Vintners prune their grape vines every year to make them more productive and to control how the vine develops during the growing season. The trimming is done during the winter when the vines are dormant. Pruning is a cold and labor intensive job that is essential to the success of the current year’s crop but is also necessary for the training and development of the vines for the future. Rick demonstrated how last year’s growth is removed and two of the best canes are left to be bent and attached to the trellis wire. The vine shoots that grow from the cane that was tied to the lower trellis wire are then trained to grow upward by having them attach themselves to catch wires above the cordon wire (lowest wire). The vines proceed to grow upward in a vertical curtain with the fruiting zone below the canopy. On the day we were pruning a lot of old growth had to be removed because Marquette vines are known for their vigorous growth. Greendance uses the VSP method on all of their vines except the American varieties (Vitis labrusca).
VSP pruning is the most common pruning method for cool-climate wine grapes but it is by no means the only one. Rick and I discussed some new ideas for managing vines in the field. I found the practice of planting vines very close together, about two feet apart, then pruning every vine back to one cane and tying down that cane to the right one year then doing the same the next year but tying the one cane to the left and continuing to alternate direction every year.
Another intriguing idea is “Wild Tail” pruning. Wild tail pruning leaves all the buds on the lateral cane that is tied to the cordon wire so the end buds develop first and delays the budding of the lower buds to protect them from a late frost. After all danger of frost has pasted you walk the vineyard and clip off all the “Wild Tails” back to the number of buds you want on each lateral. I am extremely curious to see if these methods would be successful in a cool-climate vineyard.
The goal of my visit was two-fold and with the first part completed we now turn our attention to the second part, Greendance’s planting of Petite Pearl. If you haven’t heard of the Petite Pearl wine grape you’re not alone. This hybrid grape from renowned Minnesota grape breeder Tom Plocher is just beginning to take root in Minnesota, Wisconsin and across the Midwest where it’s cold tolerance is greatly appreciated. I will be posting about my barrel tasting of Greendance Petite Pearl soon.