Posted: 27/12/2014 at 00:12
Snow acts as an insulator so don't remove it from hardy perennials but do shake if off any branches it is weighing down as the weight can permanently damage plants.
The RHS has recently recognised that varying degrees of hardiness are needed to describe plants more accurately and found that the USA zoning system wouldn't work in the more moderate but also more variable over small distances UK climate. I'm in central Belgium and find plants do better in winters with lots of snow than the ones where it is cold for long periods without any snow. It can make the difference between surviving -25C and -15C.
Imperatas, pennisetums and evergreen viburnums do not do well here.