Why wisteria wont flower

All look lovely and healthy but not one of them has ever produced a single flower. I have tried stressing them and adding something called 'Phos something or other', but no luck. No one seems to be able to explain why they are not blooming. They are all in different locations, from part shade to full sun. Hope you can help…. Mike: My folks in Ruch, Oregon near Jacksonville have a well-established wisteria over 10 years old that hasn't ever bloomed. It's healthy, puts on tons of beautiful leaves and new vines every year, and is threatening to consume their deck.

They wanted to pull it out, but I talked them out of it. What can they do to get this beauty to bloom? We have a 20 year-old wisteria that has never bloomed. It is mostly in the woods so my husband built an arbor to pull it up off the ground, hoping more sun might do the trick.

I also pulled out some of the vines that had gone to ground to concentrate the energy of the main vine. Nothing has helped yet. It is huge and lush but just won't bloom! Mike: I have a wisteria out back on a trellis. It's been there 4 years and gets bushy but no blooms. Is there anything we can do to get blooms? At Longwood Gardens they trim everything off these plants but the very ends of the runners.

Should I try this? Hope you can offer some advice before it goes to the compost heap. You're just impatient, John—wisteria generally takes a good six years to get established before it blooms. Unfortunately, some vines never produce flowers, despite the prodding of hopeful gardeners.

Though the vine cannot be forced to offer up its showy, fragrant blooms, there are several things you can do to strongly encourage blooming. These tricks will increase the odds that your wisteria will be heavy with lavish, colorful flowers and be well worth the effort. Make sure the plant is receiving full sunlight. North Carolina State University Extension recommends at least six hours of direct sunlight a day.

A wisteria tree does not tolerate shade well and may be getting too much of it. You may need to prune nearby trees to reduce shade. Prune wisteria aggressively in the spring, cutting the plant back until it is a few feet shorter than you would like it to be.

In the summer, trim as needed to keep the desired shape and cut off any runners that are more than 6 feet long or heading in an unwanted direction. Wisteria: A Field Guide. Join the conversation. Related Stories.

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