Posted: 18/10/2017 at 17:57
When you prune (probably in late February) cut to an outward facing bud.
It seems counter-intuitive, but cut the shorter stems harder back than the longer ones.
There's a gardening truth 'growth follows the knife' , so the harder back you cut the more it will grow.
Cut the shorter stems back hard and the longer stems not so hard and they will even up.
Then give them a feed of Fish Blood and Bone and mulch with well rotted farmyard manure (don't let it touch the stems) and hopefully that will perk them up.