The passion flower vine (Passiflora incarnata) is a perennial vine that dies to the ground after freezing temperatures arrive in the winter but is semi-evergreen in warmer climates. It produces intricate red, purple, or blue blooms and is a great vine for the butterfly garden. The vine reproduces freely from the roots, but can be propagated from seed as well as by taking semi-hardwood cuttings from the main plant and rooting them.
Cut a 6-inch section of the passion vine that is semi-hardwood. In other words, cut a 6-inch section of the end of the vine that is not too green and soft and not too hard and woody. Cut at a 45-degree angle just below a leaf node or an area where the leaves are growing out of the stem. Immediately place the cut end of the stem in water making sure the cut end is covered with water.
Put the potting soil in a pot and soak it with water. Let drain, then use your finger to push a hole 2 inches deep into the potting medium.
Trim the end of the passion vine cutting just below the next node up from where the original cut was made and remove the leaves from that node.
Dip the cut end of the passion flower vine cutting in powdered rooting hormone making sure the node where the leaves were removed as well as the cut end are covered with rooting hormone. Shake off excess rooting hormone and put the cut end in the hole created by your finger in the potting soil. Be sure both the cut end and the node covered with rooting hormone are covered with the potting soil.
Gently close the potting soil around the cutting and press down with your fingers to secure the cutting in the potting soil. Keep moist by misting regularly with water and put in a warm place that stays between 70 and 85 degrees F. The passion flower cutting should root in 6 to 8 weeks.