The passion flower vine, also called maypop, is an evergreen tropical vine that grows to a height up to 12 feet. Passion flower is hardy in USDA growing zones 6 through 9 where the temperatures are not freezing or too hot. The plant will die off during the winter season and grow back the following spring. Plant the passion vine along a fence or on a trellis to give it support and prune the plant for control.
Select a planting location for the passion vine plant that has well-draining soil that stays evenly moist and full to partial sunlight conditions. The plant prefers six to eight hours of morning sun instead of the hot afternoon sun.
Plant the vine in a hole that is the same depth as the container it came in and twice as wide. Add a 1-inch layer of organic compost to the bottom of the hole and place the plant on top. Gently pack soil around the root ball.
Water the passion vine generously after planting. Continue to water the plant daily for the first two weeks after planting. Water the passion vine weekly during the growing season when the rainfall amount is less than 1 inch per week. The plant will flower continuously during the summer months with regular watering and moist soil.
Fertilize the passion vine with a 10-5-20 fertilizer in the early spring before new growth appears. Apply the same fertilizer each month from June through early September. Do not use a balanced fertilizer or one that is high in nitrogen as this will promote green growth but reduce the amount of flower blooms.
Apply a 3- to 4-inch layer of organic mulch around the base of the plant. The mulch will assist with water retention for the shallow root system.
Prune the passion vine during the winter season when the plant is in the dormant stage. Trim dead and weak vines to a length that has several buds for new plant growth. Cut back all strong and large stem growth by 1/3 the length of the stem.