You can leave it or cut it- your choice.

I think it's the light cycle rather than the weather- A few of mine are blooming right now- sunburst & the eduli but caerulea has stopped.

Here's caerulea, btw:
{{gwi:1134890}}

I have a P. Elizabeth that only started blooming two weeks ago, even though I planted it in spring. At the same time, P. Incense stopped flowering. The wild incarnata all stopped flowering by the first week in September. With the cool weather now, the Elizabeth flowers stay open for several days, but others are not opening at all.

I've got Edulis Frederick getting ready to bloom, Incense a few here and there, Lady Margaret still forming buds, Lavendar Lady (so it was labeled, we probably know the truth there huh?), and Caerulea all still blooming or getting ready to bloom. I'm thrilled that both of my Ruby Glows are forming buds. Nothing on my Coral Glow, Victoria, Belotii, or what I think is Constance Elliot or Nancy Garrison.

I think my cooler nights (mid 40's-50') are helping, days area still in the 80's. Also I've noticed that all of mine are still putting on a lot of new growth.