So I've been reading this thread because I was about to ask the same question re cutting back iris leaves. First I should say that I have no idea what y'all mean by 'cutting back'. What I'm thinking of would be more of a 'trim'. Maybe I should have taken these pictures after measuring the length of the leaves. I'd go do it now if I wasn't afraid to go outside due to brutal heat and hordes of mosquitoes aka vampires.
I know these need to be divided but that'll be another day.
1st picture was taken on May 26th. An unhelpful helper planted these for me in my perennial bed so you'll see some sages as well as a bronze fennel starting to set seed. So anyway, note how the leaves are flopping over.
Next picture was taken on July 2nd. These are planted in a bed of their own, and yes they need to be divided. But what I hope the picture shows is that some of these leaves are getting really floppy.
I was thinking about a trim so they'd be about half of their length, more or less. Reading what y'all have already said, I'm guessing I should wait. But hey! I might start tripping over some of these leaves. (kidding)
All but one or two are NOID TBs.
So opinions? Advice? Please and thank you.