I'm in zone 5b (Toronto). in 2013 I bought a Wisteria Blue Moon, it was blo oming and on a small trellis. That winter it died down to the ground. Durin g 2014 it bloomed with 2 small racemes of flowers and grew back about a foo t. I protected it during winter and this year there were 6 racemes, but it also just grew another foot, not climbing at all. What could be the issue?
Is it in the ground or in a container?
Does it get full sun? It really needs a sunny location.
Have you fed it? Wisteria does best with little or no nitrogen.
Named varieties of Wisteria are usually grafted. Occasionally the graft fails after a few years. It may be that you are experiencing some early signs of graft failure.
It is in the ground, fertilized once with 10-20-10 and twice with weak 20-20-20. Full sun from noon to sunset. Usually the complaint for wisterias are that they grow like crazy but don't bloom, mine is the reverse, that's why I had to ask.
What would be the root stock they are grafted to? Since it died back to the ground, it is possible that the growth is no longer Blue Moon.
Wisterias require pruning in August and February to get the best result for blooming.
They will probably be grafted onto Wisteria sinensis. You should be able to tell if it is shooting from the rootstock rather than the scion by seeing if the shoot is coming from under the graft point. If it is the rootstock which is sending up shoots, I would expect those to be very vigorous, and the shoots would elongate rather than flower. Do the current flowers resemble those of Blue Moon or are they different? Also, different species of Wisteria are said to twine clockwise or anticlockwise.Can you check photos of Blue Moon and compare them to what the current plant is doing? Of course, even if correct, they could both twist the same way anyway!
Back to report that this year there were 8 racemes on the Wisteria Blue Moon in the spring and 3 racemes coming out now (August). Also 2 long wispy growths this year, so maybe it was just taking its time to climb.
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