I planted a wisteria last spring -- it had two purple blooms on it, and grew like fury all last summer, twining around the pergola. Wonderful, I thought! This spring, it had no flowers, but sprang into leaf, so I was prepared to be patient as far as flowers are concerned and just watch it grow --- well, it hasn't! After developing leaves, it stopped: the leaves do not look terribly healthy (yellowish), and there have been no new shoots -- no real growth, just some petrified looking foliage. I've given it water and fetilizer -- what else should I do?

We live in a tough climate area: freezing cold strong winds, followed by sudden heat -- turning into a heat wave: that's Provence for you. Paradise for people, but hell for plants. Still, I thought that wisteria is pretty tough and there are magnificent ones in the area, so it is possible.

If anyone can tell me why a plant just stops growing and goes into a dormant state, I'd be very grateful!