Last spring my wife and I planted two passionflower. We got a lot of
enjoyment from their blooms over the summer.

Over the winter the plants froze to the ground. We cut off all the dead
growth--essentially taking the plant back down to ground level. We weren't
sure what would come of that, but when it warmed up, the plants sprung to
life. Both of the plants now are very healthy. They have grown to the top
of an 8' fence and have spread to a width of about 10'. They seem very
healthy. The problem: neither of them has bloomed (or put on any buds)
this entire season.

What can I do to induce them to bloom? Is there something different I
should have done with their care in the past or should do in the future?

I live just north of Pensacola, Florida.

Tony