Well, you did right in selecting a plant that was in bloom. You at least know what you're getting. The most common problem with wisteria not blooming is late spring frosts or cold weather. But my guess that in Ventura county that hasn't been your situation. The second most common problem is improper pruning. Wisteria bloom on the previous years growth. So the strategy is to select a few canes to serve as the main frame of the plant. It will need something to grow on and, once established, won't give up that frame. So select your structure carefully. Here in Oregon we prune our wisterias in the fall, after the flowers are spent. We train the leaders we want to be the scaffolds, and cut the spurs back to about 4 to 6 leaves. This is where the new buds will develop. The rest we cut away. I don't know what variety you have but this is a large plant! You can get some nice flowers for a few years, but eventually it will become root bound in that pot and stop flowering again. Is there not a good spot for this plant in your garden? Perhaps somewhere close to the house where you can smell it! Your Ventura County Extension agent will have information on how to prune, and maybe a schedule of classes too.