The Campsis vine, also called trumpet vine, is a climbing vine that clings to a structure or arbor and reaches a height and length up to 30 feet. The vine is hardy to plant in USDA growing zones 3 through 9 and should be planted in early spring for best results. Propagate the vine by taking softwood cuttings in late spring from stem sections that green and flexible or semi-hardwood cuttings in midsummer from stem sections that are starting to mature and stiffen.
Wash cutting tools and planting containers with a solution that is nine parts water and one part bleach. Rinse the items well to remove bleach residue and allow them to dry before using.
Cut a 6- to 8-inch stem section with a sharp knife or pruning clipper from new growth on the Campsis vine. Remove all leaves and buds from the lower one-third of the stem and cut remaining large leaves in half.
Create a rooting medium by mixing together sterile peat moss, coarse sand and perlite in equal portions. Add water to the mixture so it is moist but not wet. Fill the medium into a rooting tray and set aside.
Dip the end of the cutting into rooting hormone to stimulate root growth. Tap the cutting to remove excess hormone and stick the leaf-less section of the cutting into the rooting medium. Firm the soil to hold in place.
Mist the cuttings and rooting medium with water to increase the moisture level around the stems. Cover the tray with clear plastic to hold the moisture around the plants. Place the tray in a warm location with indirect sunlight. The top of a refrigerator works well if light is available.
Check the cuttings after four weeks of growth to see if roots are present by gently pulling on them to see if there is resistance. Softwood cuttings will form roots faster that semi-hardwood cuttings.
Transplant the Campsis vine cuttings into individual growing containers when the roots are a minimum of 1 inch in length. Grow the cuttings in containers until they are strong enough to plant outdoors.