Purple passion flower (Passiflora incarnata), also known as the maypop, is a fast-growing evergreen vine that will quickly wrap its tendrils around a fence or trellis. The plant is appropriately named for its stunning purple flowers that appear in summer and early autumn. The flowers, which can be as large as 5-inches across, only last about a day but will be quickly replaced by more blooms. The colorful blooms make the plant a good choice for a butterfly garden. Purple passion flower is a tropical plant that can tolerate an occasional light frost, but won't survive a severe freeze.
Plant purple passion flower where the vine will be exposed to full sunlight. Although the plant can tolerate partial shade, sunlight will bring out the best of the big, colorful blooms. The vine will grow in nearly any soil that drains well.
Install a trellis immediately after planting, or plant purple passion flower where the vines will be supported by a fence or other supportive structure.
Water the purple passion flower vine regularly and keep the soil moist. Although the vine is drought-tolerant, regular watering will promote continuous flowering.
Feed the plant in early spring using a granular 10-5-20 fertilizer. Repeat every four to six weeks through July. If you live in a warm, humid climate with no light frosts, continue fertilizing the plant through October. Spread 3 lbs. of fertilizer around the base of the plant, then water deeply.
Prune the vine during late winter when the plant is dormant. Remove any dead or spindly growth and cut the vine back as necessary to control size and keep the plant neat.