the really large pot could possibly be too large,.. how is the drainage? I probably would take the sweet potato vine out and replace it with annuals for the added fullness.. I am guessing the pot size is probably the culprit. I would repot it and try that first.

What kind of passiflora is it? I have a hard time believing *any* passiflora would react badly to having more room to grow--they're notorious for wanting lots of space.

Where is the pot situated? Is it getting enough sun? How much are you watering it--too much water makes most passis unhappy.

Responding to the comments thus far, the drainage is good -
there are stones in the bottom of the pot and drainage holes. The plant is on my lanai - sunny all day. The rainy season has not yet started here (any day now!), so overwatering is not a problem. The plant is located where it always has been and performed wonderfully. I'm wondering if I cut it back too far? It keeps spurting new growth which looks real good for a week or two and then it wilts, dries up and dies. The species, I believe, is edulis.

Whenever I have had Wilting problems with new shoots I would reduce the amt. of Direct Sun it is receiving; when you furst start to notice the wilting then I would move my plant to where it gets morning sun and late day sun and that has usually alleviated the wilting problem for me. I also lightly Fertilize 1 time a week. Normally I would use a Fertilizer for Root/Leaf Growth and then when they have established good stems I change to a Fertilizer for Flowering. This year I have tried something a little different and it is working really well for me. I Fertilize with a Starter Root/Leaf fertilizer and 2 days later I fertilize with a Fertilizer for Blooming and then I wait 7 - 10 days and repeat. This method seems to be working really well for me. In 3 weeks my Passi Sapphire went from a 6" Stem with 4 Leaves to completely covering a 6ft. Wire Trellis