Reprinted with permission from Red Wine: The Comprehensive Guide To The 50 Essential Varieties & Styles by Kevin Zraly, Mike DeSimone & Jeff Jenssen, Sterling Epicure, 2017. In the Vineyard In winter months, workers prune vines by hand to coax the correct number of grape bunches to grow the following summer. Farmers who don’t use herbicides weed at this time also. In February come fertilizer and replanting.