DetailsPassiflora caerulea is a perennial climbing vine native to South America. It prefers full sun to partial shade, well-draining soil, and warm temperatures. It is considered hardy to below freezing, as when the foliage dies back to the ground it will regenerate from the roots. Passiflora caerulea flowers from early spring through fall, and produces edible orange fruits. Passion flower has a history of use as a treatment for anxiety and as a relaxant.