The passion flower is also known as maypop in the southeastern United States. You can see them growing as weeds along roadsides where the grasses are not mowed. Farther north, the plant has been cultivated as a houseplant in areas where the freezing winter temperatures would normally kill it. Since it is somewhat cold hardy it can be grown in areas above the southern states but it will need a little more care. They are propagated pretty easily with woody cuttings and are especially beautiful if allowed to climb and ramble along fences or up and over trellises.
Remove a vigorously growing side shoot from your passion flower vine. Cut it at a 45-degree angle just below a node. Try to get a section that is about 8 to 10 inches long with four to six leaves growing.
Remove the bottom two or three leaves from the passion flower vine cutting. Dip the freshly cut woody piece into the rooting hormone powder all the way up to the area where the last leaf was pulled off. Each of the nodes will be areas where roots will spout from.
Poke a hole in the damp sand with the back of a pencil so that it is about as deep as the area of your cutting that needs to be planted. If the last node where you pulled off the leaf is three inches from the end, then bury the cutting 3 inches down. The more area that is buried, the more chances for root development.
Make a plastic dome over the pot and buried cutting. You can use a plastic band and a rubber band to hold it in place. This will keep the cutting in a moist environment. Allow it to sit in a warm place of about 72 degrees for about 3 months. As soon as you see new growth, it is time to take the next step.
Open the plastic dome and carefully turn the container upside-down to remove the rooted cutting. Shake off excess sand and plant the new passion flower vine in a planting pot filled with regular potting soil. It will grow rapidly indoors in a window with indirect sunlight if the weather is not warm enough to plant it outside.