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Pruning is the secret to good flowering, as wisteria only blooms on new wood. Prune wisteria in late winter. Remove at least half of the prior year's growth, leaving just a few buds per stem. Informally grown, mature plants need little or no subsequent pruning.
Keeping this in view, does wisteria flower on old or new growth?
Wisteria produces its flowers buds during the previous growing season ("blooms on old wood"). If the plants were pruned from late fall to early spring, those buds were removed. There are some steps you take to encourage a reluctant wisteria to bloom.
Also asked, why does my wisteria not flower?
The most likely reason your wisteria won't bloom is due to too much nitrogen. When a wisteria plant has too much nitrogen, it will have plenty of foliage growth, but very little and maybe no blooms. The last, and least likely, reason a wisteria won't bloom is over pruning. Over pruning will remove the flower buds.
Pruning Mature Wisteria Plants Cut back new growth and main branches to just two or three buds to keep the plant neat, tidy and ready for the forthcoming growing period. Hard pruning may be required if there are dead stems to deal with, or particularly woody areas of the vine causing gaps in the foliage and flowering.