It's driving me doolally! Two climbers I had nurtured from seed for six months, severed about 3 inches from the bottom! First assumed it was slugs, then mice, but I've just noticed whatever it is has now done a new clematis, had a flower bud on it and everything! Every time it literally looks like someone has snipped the stem with secateurs- I could cry! Any ideas what it could be and/or how to stop it?