We have on our old cottage 2 wisteria (one purple, one white).

We moved in some two years ago and the purple one stretches
down one wall (approx 6 mtrs then splits (one way goes on for another 7mtr approx. and the other about 4 mtrs) This is doing just fine, lots of leaves and flowers. The problem one (read disaster one) is the white one. This leaved up this spring and flowered as usual (lots of) but suddenly we lost both flowers and leaves. Its length is about 3 mtr where it splits, one half continuing on upwards for about another 5 mtrs, the other half is also about 5 mtrs in length. We did notice that it looked sickly just after flowering. We have had a fairly dry winter (Somerset) so immediately suspected lack of water. Its located nearly next to the house wall so not a very good location for water. We are currently without any leaves although most of the wood is still pliable.

Is it dead or will it recover?

For some reason (whether connected or not) the crab apple located in the same vicinity also seems to have taken a knock although we cannot remember any bad / late frosts.

regards