You can do them now if you like, but I'd wait till more of the flowerlets had died back, but before seed pods start forming.

I sometimes run my hand down the spent flowers rubbing them off but leaving the rest of the flowers to open.

That's a great tip SBG as I don't enjoy them when they are half gone like this. :)

Its a personal choice really. Depends whether you like to get your money'sworth!

oh I like to get my money's worth that's for sure ;o))

A woman after my own heart...