4 year old-fashioned wisteria.? My wisteria looks very hygienic, no bloom as yet. I call...

My wisteria looks very hygienic, no bloom as yet. I call for to cut it back as its gone crazy, I havent ever really pruned it properly, just cut a few bits sour. How far back can I undamagingly prune and when please?
Answers:    This time of year Wisteria usually is dormant if you live in the U.S. You can cut it subsidise as far as you need to.
I, too, own a 4 yr. old Wisteria and as a rule of thumb I prune it almost impossible to tell apart way I prune my rose bushes. I prune 1/3 rotten each runner. I braided mine untimely so it has taken on a tree form and blooms excellently each year. Hope this help.