Grapevine Hardiness and Using the USDA Hardiness Zone Maps

Rick Dunst, Viticulturist, Double A Vineyards, Inc.   Winter injury caused by low winter temperatures is an important limiting factor to grape production in many regions the United States. Our Grapevine Characteristics Chart lists grape varieties by their winter hardiness according to USDA hardiness zone. Hardiness is determined by using a number of sources, including university publications, …

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Grapevine Rootstocks

Rick Dunst, Viticulturist, Double A Vineyards, Inc. Selecting the proper rootstock for your vineyard is just as important as variety selection. Rootstocks are used to induce or reduce scion vigor or to overcome specific soil limitations caused by physical factors such as soil pH and high salt content, or biological factors such as phylloxera, nematodes, …

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