Judicious pruning is the secret, assuming your wisteria is in sun - they don't flower very well in shade. They should be pruned twice a year - shorten all laterals (side shoots) by half in August, and then reduce them back to 6/ 8 inches, to a spur (leaf node or joint, a sort of bump on the stem) in February and this should let any flowers stand out. If you're worried you might cut off growths that would have flowered, prune it once the flowers have formed.

What great Info Bamboo would this apply 2 my 18 inch high 1 to? its never flowered but has many Leafs :) Jacx

If its not long been in, best thing is to train it early - restrict growth from the roots down to one, two or three main stems (depending if you want to spread it out along a fence both sides eventually). If you want to grow it up a pillar, restrict to two or one main stems by removing all other stems at the base. When the main stems get to the height you want, cut the top out - this will encourage side shoots. You can also shorten the laterals (sideshoots, if you have any) in February, or take some off now if you need to, and do the proper back to six inches thing in February (by mid Feb at the latest, incidentally) Then do what I described above every year.

Many Thanx Bamboo 4 your Info Jac :D

mine throws up these very long whippy stems from a good strong stem. what do you do with those? are they the laterals you are talking about bamboo?

Yes, if they're side shoots - if they coming off the top and you don't want that much height, chop em off, just leave the laterals in place.