The flowers of trumpet vine (Campsis radicans) are attractive to hummingbirds due to the trumpet shaped flowers and nectar. In addition, many types of birds like to nest in the dense foliage. The flowers are followed by large seed pods.
One caveat about this beautiful plant, it is an enthusiastic grower. If you are positioning it near a structure to climb, such as a building, pergola, fence or pole, be sure it is strong enough to support the weight. The vines get extremely heavy and thick and can grow to 40 feet tall, with each vine having a spread of about 10 feet. Sometimes gardeners choose to allow it to ramble down a bank instead of growing vertically. It is an amazing sight to see the gorgeous flowers blanketing the area.
Another caution is some people have experienced an allergic reaction when coming into contact with the leaves. Typically the allergic reaction results in red, itchy skin.
Easy to grow, it thrives in zones 4 - 9. Michael Dirr, Ph. D, expert horticulturist specializing in woody plants has expressed this opinion about growing trumpet vine "if you can not grow this [vine], give up gardening."
To grow trumpet vine, there are a few tips:
Find a location where the soil drains well. Trumpet vines tolerate poor and compacted soils but they don't appreciate swamp like locations.
Plan to place your trumpet vine where it will receive full day sun or lightly filtered sunshine.
After planting, water your vine generously. Plants develop sprouts quickly in warm soil.
Water as needed during the growing season, depending on the amount of rainfall has occurred. Trumpet vines need an average amount of water, about 1" per week during the growing season.
After flowering has finished for the season leave the foliage in place; don't cut it off. The leaves will gather sunlight and provide nourishment for next year. It will also continue to give privacy if being utilized for that purpose.