In the picture you should be able to make out a wire supporting the two horizontal canes coming from the trunk. Those ones stay put. Above that two more wires are visible (one is in front of the vine, the other behind) whose job is to contain the shoots (which would otherwise flop down). As the vines grow, wires are placed higher and higher up---there are some more out of the photo. The fruit having been picked, the vines will soon be pruned, and two shoots per vine will be chosen to be next year's canes. The wires have to be moved up and out of the way of the trimmers (they are held by clips nailed onto wooden posts). Sometimes easy, but sometimes, when they are tangled in the vines, the wires can be difficult to move.
(What's shown in the picture is vertical shoot positioning, or VSP, which is how most of the vineyard is pruned. Some of the vines are in the Scott Henry arrangement, which has four canes, with shoots going up from two and down from two.)
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