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Hi Anon.
Wisteria in full bloom is a magnificent sight and I can see why you'd want to encourage it. Firstly, what is the location?
Wisteria don't like shade. If you can, always grow on a south facing wall so they get the full benefit of the sun. If you are not able to move the plant , or if you don't have a south facing wall, try to cut back anything that might be causing shade.
If you are south facing and still having a no show, then feeding may be the clue. Anything that puts on a good performance for us will need a good diet to keep up that performance. Try raking in a dressing of superphosphate and sulphate of potash in spring. Water well and mulch heavily after to keep that moisture in.
If, as I am guessing, you are on a light sandy soil, that could be the cause. The potash will help. You will know if it's low potash if you have a lot of lush green growth but little or no flowers.
Less likely but still worth considering is whether or not the plant has grown from seed or if it was bought from a nursery as a grafted plant. Grafted plants are much more reliable and the flowers come earlier in its life as well as being a much better colour.
Frost or bird damage are the last options. I imagine you will have seen either of these so will already be aware if you are suffering from these.
Finally, the flowers normally appear in spring through to summer so if you chopped your plant back hard just after March, you will need to wait until next year to see results.
The smaller plants you've seen in flower may have been pruned to keep them small or may have been grafted onto smaller rootstocks. A seed grown plant will have to grow larger and older to get the same amount of flowers.
Don't be disheartened, keep feeding and water and mulching. The wait will be very worthwhile so take some pictures when it does bloom and send them in!
The Green Knight
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