How to Plant Campsis Radicans
Campsis grandiflora, commonly known as the Chinese Trumpet Vine, is a fast-growing, deciduous creeper with large, orange, trumpet-shaped flowers in summer. It can grow to a height of 10 meters. A native of East Asia, China and Japan it is less hardy than its relative Campsis radicans.
Campsis grandiflora prefers moist, nutrient-rich soil and a position with full sun and support to climb. The dark green leaves have serrated edges.
Synonyms include Tecoma grandiflora, Campsis chinensis, Campsis adrepens, Bignonia grandiflora and Bignonia chinensis.
Campsis radicans or trumpet creeper, is a quick growing, perennial vine that has invasive tendencies. Despite its reputation, campsis radicans does have redeeming qualities such as the bright, orangey-red blooms the vine produces in summer. The 3-inch flowers complement deep green foliage that climbs any structure within reach. Campsis radicans thrives when planted in U.S. Department of Agriculture plant hardiness zones 4 through 10, growing to heights of 40 feet with a 10-foot spread.
Prepare a planting site that receives full sun during the day. Select a site that contains well-drained soil with a pH of 3.7 to 6.8. If you do not know the pH of your soil, test it with a soil testing kit purchased from a garden center.
Loosen the soil by turning it over with a pitchfork and amend if necessary. Lime will raise a pH below 3.7 and peat moss will lower a pH above 6.8. The manufacturer's label on the amendment provides application methods and allocation amounts.
Bury the root-balls of the campsis radican seedlings in planting holes that measure 3 inches deep, spaced approximately 5 feet apart. Pat the soil around each seedling to remove air pockets.
Water-in the campsis radican after planting. Soak the soil to a depth of 1 inch with a garden hose. Keep the soil moist to the 1 inch depth throughout the growing season with supplemental watering once a week in the absence of rain.
Spread a layer of bark chips around the campsis radican vines to suppress weeds. Weeds will compete with the vines for water, a situation that can inhibit growth. A 3- to 4-inch layer of mulch is all that is necessary to keep the weeds at bay.
Tips & Warnings
Campsis radicans will die-back on their own in the fall and reemerge in the winter.
Due to their invasive nature, campsis radicans requires pruning in the winter or spring before new growth appears. A heavy pruning with a pair of pruning shears will keep the plant neat and tidy. Avoid pruning more than one-third of the vine in a single pruning.