Perovskia - how much would you cut down?

I have pruned it down to the first leaves but my feeling tells me that it should be half the height.
What do you think?

Many thanks in advance.

 

Hi

looks fine to me as is

Spruce

 

You’ve got a good framework there @simone_in_wiltshire. If you cut it any shorter the young tender growth would be easier for slugs to reach .

 

Too late. I watched a video online and remembered that Avebury also had cut it right down, I gave it another trim. Let’s hope it works out

 

@Spruce and @Plantminded That's what it looks like now.

 

That looks fine @simone_in_wiltshire. That's about the height that I reduce my Verbena bonariensis to. Your Perovskia shouldn't be tempting for slugs anyway because of the strongly scented, tough, silvery foliage. They don't touch my Salvia Caradonna which is in the same family (mint).