Starting to flower? Or...?

I snapped some pics of my outdoor ladies, hoping someone can tell me whats goin on with these new leaves. For the past two weeks or so, they've been growing very purplish/pink leaves at the very center of each bud area, but no signs of buds yet. Maybe some sort of deficiency? Or starting to flower? Thanks in advance!

It had occurred to me that this also might due to temp swings at night, but given that i don't have much outdoor experience, i'm unsure. Still hoping someone might be able to provide some wisdom here.

Well.. I don't think it has anything to do with flowering, but what the hell do I know?