Yesterday I found a Berberis Red Pillar, it was hidden at the back of a
deep
border, is about 6 years old and very overgrown, I cannot decide which is
the best way to prune it. A small tree that was in front of it has been
removed and so it now has plenty of room to grow and be beautiful.

Berberis will take very hard pruning, or even decapitation, and grow
back strongly ( strong new growth of several feet a season when it has a
well established root system like yours). The new growth will be much
straighter and better colour foliage than old stems. All you lose is one
season's flowers and tbh I never like berberis flower colour against the
red/purple leaves.

Janet

Thank you Janet, that is just what I needed to know, I will go and do it
right now !

kate