The passiflora is a fast-growing, perennial vine that can reach heights of 20 feet, depending on the species. This tropical vine features showy, complicated flowers in a rainbow hue of colors. There are over 400 species of passiflora, and most are nicknamed passion flowers. The maypop, which features purple flowers 3 inches in diameter, is especially popular and has an average height of 12 feet.
Plant your passiflora vine in late spring or early summer. These perennials cannot survive cool temperatures and can only be grown in tropical or subtropical climates. Choose a warm, sheltered area, such as a south-facing wall.
Ensure that your passion flower receives plenty of sunlight. This plant needs around six hours of sunlight per day in order to thrive. Direct, hot afternoon sun may scorch the vine's tender leaves, however, so morning sun is best.
Provide support for your passiflora vine in the form of a trellis. These vines grow quickly and feature large, heavy bunches of leaves and flowers. If not supported, they will fall to the ground.
Water enough so that the soil is moist but not soggy. Passiflora can tolerate short periods of dry soil, but not long droughts. Twice a week waterings are usually enough unless the weather is very hot, at which time you should increase the waterings to every other day.
Fertilize your passiflora with a potassium-rich fertilizer. These are often called potash fertilizers. Follow the directions on the package as per the size of your plant. Fertilize often; every other week in the spring and summer. Stop fertilizing when fall arrives so that the plant can go dormant for the winter.
Prune your vine in late spring. Cut away dead or decaying branches. Prune also to control the shape and size of the vine. Passiflora is hardy and fast-growing, which means it can quickly overtake and even kill nearby desirable plants. For this reason, it should be vigorously pruned for control purposes.