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090504_333_Grape Lady Downe's Seedling.jpg
Grape vines trained using the singe cordon or rod-and-spur system comprise a single upright stem (the cordon) from which horizontal, fruit-bearing laterals shoot out left and right, like arms. In spring, remove all except two shoots from the spurs on the cordon. Once you can tell which is the sronger, start training it horizontally, then remove the weaker one, along with any other new growth.