I have just been pruning my buddleia Pink Delight and alot of the leaves look grey and are shrivalling up. I always thought it was impossible to kill buddleias. I have done some research thinking maybe it had something wrong with it but all I can find is that maybe it got too wet in the winter. I lost one a couple of years ago. The leaves just shrivalled up and it died so I am abit worried. Is there anything I can do?