Hmmm, it may be too early for Z6. My Little Lime is now opening some flower buds.

I just noticed buds on one of mine yesterday starting. Didn't check the other one. None were there last week. Now my Quick Fires are in full bloom of course.
Cher

My Pinky Winky's have formed flower buds but are no where near opening yet.

I will check my Pinky Winky more closely when I get outside today in my Zone 6 garden, but at the moment, I remember no buds on my Pinky Winky which, however, isn't in the sunniest of spots, so it might be a bit behind schedule. In contrast, my other paniculata--Vanilla Strawberry--has formed some buds which haven't opened yet. It is in full sun.

I'd guess the paniculatas--in my garden anyway--need a couple more weeks to reach the blooming stage.

Kate

If and when the stem ends begin to look "bunchy", and little green balls are forming below small clusters of new leaves, you'll know buds are coming. They're beginning to form on mine currently.

Update: I just remembered to check my Pinky Winky. Turns out it has started to form buds, but I still think it will be a couple weeks before it really starts blooming.

Kate

Thanks everyone. I'll be patient. My Merritt Supremes are in full swing and the Vanilla Strawberry is beautiful. Guess I got greedy :)

My PW is usually blooming at this time but it's just showing buds. Blame it on harsh winter?