Cane color should be noted post-harvest as your grapevines lose their leaves and 'go dormant'. The proper color is indicative that they have hardened off or lignified after adequate exposure to sunlight during the growing season and have stored sufficient carbohydrates to survive the impending winter season intact. When pruning later in the winter or early next spring, these characteristic colors should be selected for in the canes and spurs you choose to leave as fruiting canes in the upcoming vintage. Another characteristic of note, is internode length. Most sources suggest a node spacing or internode length of about 3-5 inches...or about a 'fist width'. Check out the photos below. These were taken at the NMSU Los Lunas experimental vineyard on Friday, October 30th.
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Recently defoliated canes of Cynthiana/Norton (Vitis aestivalis x Vitis vinifera). Notice the dark red color of the periderm or bark of the canes. This red coloration is characteristic of this cultivar.
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This is a cane with typical bright brown color of most Vitis vinifera cultivars, the European wine grape.
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