Most flowering vines respond to some restriction so pruning is vital!  Left to their own devices, they can become quite rampant and actually flower less prolifically.  Vines can become quite heavy and over time may start to burden any support framework you have used.  This is O.K if it’s an old piece of trellis, but not so good if it’s your pergola!  If we take the beautiful Wisteria as an example: it pays to prune this vine in the summer, cut back all new shoots so that you are left with 3-4 leaves from its starting point (the buds at the base are next year’s flowers).  You can do this throughout the summer, controlling the straggly green shoots, to redirect the plants energy into bud-making, not just an abundance of leaves.   If you have been neglectful in the pruning area, an initial aggressive winter prune will set you up for those summer prunes.  Wisterias are quite forgiving so you can prune them into shape without hesitancy.

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