By Barley
Somerset,
United Kingdom 
Hello I have recently bought a house which has a very large wisteria in the garden. This year it had lots of formed flowers maybe as much as 6 inches long but they never came to anything and the petals are like empty husks and are just falling off. It does not get very much sun but is against a high wall and sheltered - I would think it is quite a few years old.
15 May, 2010
Answers
Thanks... I will try to bear this in mind next year, sadly think I'm out of luck for this year.
15 May, 2010
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Two things might cause this - sudden frost or sudden fall in temperature between the flower forming and then trying to bloom (that's certainly the conditions we've had here in London) or shortage of water.
15 May, 2010