pruning hebes

yes you can and how much depends on the size it is and what you want. I tend to do mine in spring. you can be quite brutal too. I once 'hacked' one down to 8" and in 2 years it was back to being 1m tall. cut out any branches that are damaged or spoil the overal shape of the bush. the rest just smaller than you want it to be.

Agree completely with Seaburn because i've done the same, although i've done it all times of the year.