when and how should I prune my passion flower vines
I'm in Clearwater, FL and vines are flourishing but getting bare at the bottom.
Passion flower is very tough, and you're unlikely to harm it by pruning too much, but if you want to encourage some growth from the base, I think fall would be a good time to prune. Cut back the branches that are bare to within 6-8" of where they emerge from the ground or main stem/ trunk. This article has some more information you might find useful: https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm