My passion flower did not flower this year, lots of growth but no flowers. I have it in a large pot and water regularly. Should I cut it all the way back for winter and move into a sheltered area? I live in Vancouver, Wa. and we get pretty cold weather in the winter. We had a foot of snow last year that's very unusual, but the passion flower may not make it through that kind of winter. This was the first year for this plant. I also planted a purple morning glory with it and it did fantastic.
No Flowers on Passion Vine
Certified GKH Gardening Expert
It could be a fertilizer issue if you have been giving the vine any--specifically, nitrogen. Too much actually results in more foliage growth and less blooms. Plants need a balance between phosphorous and nitrogen to bloom well. I would recommend giving it some bone meal to increase phosphorous.
As for wintering the plant, this article will help: https://www.gardeningknowhow.com/ornamental/vines/passion-flower/preparing-a-passion-flower-vine-for-winter.htm