Trumpet vines need to reach maturity to flower. This can take up to five or seven years. Make sure the plant receives plenty of sunlight. Move plants to a full sun location if needed. Avoid high nitrogen fertilizers near the plant. These encourage leaf and stem growth and discourage flowers. Usually a solid performer, trumpet vine sometimes fails to bloom.
Understanding trumpet vine's needs and blooming habits will help you coax the maximum bloom out of your plant. An adaptable North American native, trumpet vine grows in U. Department of Agriculture plant hardiness zones 4 through 9. In nature, it grows in moist woodlands. After flowering in summer, it develops long, winged pods that look like a cross between a string bean and a flying maple seed. The vine climbs by aerial roots, but it's usually given support in the garden.
Trumpet vine can be invasive and when left unchecked, it can sprawl over small shrubs and smother them. Trumpet vine will grow in part shade, but it blooms best in full sun.
As a last resort, an herbicide can be applied. Choose the correct spray by checking the label to make sure trumpet vine is on the list of plants affected.
Cut the vine back as close to the ground as possible and spray the stump. Then cover the stump with an old coffee can or something similar. If necessary, protect neighboring plants with a cardboard shield to avoid overspray.
Despite a reputation for being difficult to maintain, trumpet vines are easy to grow and will provide a beautiful cover in addition to habitat for nesting birds and food for pollinators.
Choose a good location for your trumpet vine keeping in mind some of its drawbacks. Once established, annual maintenance will become routine and allow you to enjoy the plant for many years. Campsis Radicans. North Carolina State University Extension.
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