There are many species of passion flower in a variety of colors, but some are more cold hardy than others. In the Southern United States, the passion flower grows wild along roadsides and in ditches. It has been nicknamed Maypop in the South because it seems to just pop out of the ground in May. Passion flower is hardy to gardening Zone 5 and can be grown in containers indoors. The plant can be propagated through cuttings or seed, however, either method takes quite a bit of time. It's much quicker and easier to start with a nursery plant.
Choose a location for your passion flower plant that has full sun to partial afternoon shade. Planting should be planned for early spring as soon as all threat of frost is over.
Dig a hole twice the diameter and 3 inches deeper than the container you purchased your plant in. Remove all weeds, grass and stones from the dug-out soil.
Mix the cleaned soil with compost to a ratio of 50/50. Place 3 inches of the amended soil back into the planting hole.
Install a trellis just outside of the planting hole if you're not growing the plant next to a fence. Do this now so you do not harm the plant's roots after planting.
Remove the passion flower plant from its container and knock off some of the soil on the roots. Do this very carefully, as the plant's roots are very brittle and can be damaged easily.
Place the plant in the hole and fill it halfway with amended soil. The plant should be at the same level it was in the container. Water to settle the soil around the roots and continue to fill until the soil is even with the surrounding ground.
Water thoroughly to establish the roots to their new surroundings. Gently twist some of the plant's leaves around the trellis.
Fertilize after planting with a 10-5-20 fertilizer and every six weeks throughout the growing season. Follow the manufacturer's directions for the amount to use each time.
Take cuttings from mature wood with sharp pruning shears in late summer. Cut 4- to 6-inch lengths and pull off the bottom leaves.
Place each cutting in a 3-inch pot filled with one part potting soil and one part compost mixture. Water the soil to keep it moist. Bring the pots indoors and place them in a bright area. It can take up to three months for the cuttings to start to root.
Place 4 inches of mulch over the soil around the passion flower's root system in the fall. This will protect the roots throughout the winter. The vine may die off if you live in an area that gets freezing temperatures, but the plant will come back again in the spring.