On 10/09/15 01:12, T.Chai wrote:
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.

Wisterias require pruning in August and February to get the best result
for blooming.

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.

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!

--

Jeff