By Canalhopper
Denbighshire,
United Kingdom 
This hebe is out growing its welcome! I think it’s called firework or firecracker. It has two colours of flowers, light and dark pink, and look like fireworks when it’s in flower. My question is: can I cut it back when it’s finished flowering? How much can I cut it back?
Edit: I updated the question, to get the photo the right way up. Sorry it deleted the comment too.
25 Jun, 2021
Answers
I find that it doesn't regrow from the woody stems. So as Yorkslass suggests do it a bit at a time. Perhaps try cutting just a small amount right back to the wood as an experiment. It takes well as a cutting too.
26 Jun, 2021
Thank you both.
27 Jun, 2021
I've cut them back with no problems but with one that size I'd do it part at a time so as not to shock it too badly.
25 Jun, 2021