Passion flower (passifloraceae) is a fast-growing perennial vine native to Southern Brazil and Argentina, with more than 400 known species. Reaching from 15 to 30 feet in height, passion flower will climb over fences, walls and trellises. It blooms in late summer into the fall, with 4-inch fragrant flowers in either white or blue/purple followed by edible egg-sized orange fruit. The fruit is not produced until the third year after planting. The care of a passion flower plant is relatively simple---this hardy vine will grow well in most climates.
Grow your passion flower vine in a location that receives full sun all day long. In really hot climates, some partial afternoon shade is tolerated. The soil should have a pH of 6.5--7.5 and be well drained for the vine to thrive year after year.
Water on a regular basis two to three times weekly during the active growing stage when the plant is blooming and fruiting. The soil should stay moist but never be soggy. Use a soaker hose for deepest watering and to avoid getting the foliage wet. Let the soil dry out in between watering when the plant isn't blooming or fruiting.
Apply a thick 3- to 4-inch layer of mulch around the base of the vine to protect the shallow roots from cold temperatures and to help the soil maintain moisture during warmer months. Use shredded bark or pine needles.
Grow passion flower near a foundation or wall in cooler climates. This helps to protect the plant against cold winter weather and winds.
Feed in the early spring once a month with a 10-5-20 slow-release fertilizer. Once the plant begins actively blooming, apply the fertilizer every two weeks. When the plant is done fruiting in the late fall, discontinue using fertilizer until the following spring.
Prune two to three years after planting to allow the vine time to grow to its fullest. Prune in the late fall after fruiting is done by cutting off any dead branches and side shoots, then cut the whole vine back to one-third of its growth.