Posted: 30/06/2015 at 06:29
Hi Renata. Don't cut it back now or you will lose the flowers. Just dead head the flowers as they turn brown and more will come. After the leaves fall in autumn you can cut all the branches back by a third but take out any branches in the middle of the shrub that cross one another - basically open up the centre of the shrub - and then next March give it a more severe cut. If you do this every year you will be rewarded with flowers within eyesight and all the lovely butterflies that flock to them.