Grapevines are exuberant climbers ... stems from which fruiting sideshoots arise annually. In mid-winter, prune some sideshoots back to one bud and others to two. Cut back developing main stems ...

But judging when to prune grape vines is critical, too early and they can be damaged by frosts and go too late and the vines ...

Grapevines are ideal plants for covering gaps ... one each side of the cane. Prune the third stem, leaving three buds to provide replacement stems next year. In spring, allow shoots to grow ...