Wishing for Wisteria
After seeing these two photos, I'm getting serious about my wisteria this year! Here are some tips that I found on Rodale's Organic Life.
The biggest frustration that gardeners face when growing wisteria is that plants have a longer-than-average juvenile period and sometimes fail to bloom as expected.
Don't over fertilize. After the plant fills in its trellis, water it only during drought and fertilize if the foliage yellows and new growth is poor.
You can improve flowering by pruning heavily after bloom time, in late spring or early summer.
Starting about 4 feet from the trunk, cut 18 inches down into the soil with a spade, circling the trunk. This process tends to "shock" plants back into flowering.