Lavenders are said not to like being cut hard into old wood. But I've never put this to the test so can't confirm. If it hasn't gone brown give it a bit of time. There's nothing you can do to help it.
Suggested reading, 'Games People Play' by Eric Berne
How far did you cut them back and have they got any leaves now?
Maybe someone else will have a photo
B3's plant sounds like Lychnis coronaria which I think might be the same as Pete's rose campion
Sounds wonderful GD
Papi Jo says:Pieris? See original post
I think so but acid lovers are outside my experience
I think it's a willowherb but not rosebay, Possibly Epilobium hirsutum.
I don't have to go far to view this one Bob
Omphalodes cappadocica 'Starry Eyes'