I tried feeding my buddliea, adding compost and watering. It still looks dead. My GF told me that she'd heard that if you snap the older branches and they're still green, it's okay - the plant will survive. The woody parts of the plant show white when they are broken, and the younger parts are green turning to white. Should I give up and buy a new one? I know you have to be optimistic to be a gardener, but it looks so sad!