Garden Scheme
Plant library · Vines & Climbers
Campsis radicans
Trumpet vine is a vigorous perennial climber that brings orange-red trumpet flowers from summer into early fall. Reaching about 35 feet high and 10 feet wide, it is a major vertical element rather than a small trellis filler. Use it where its hummingbird-friendly bloom can be seen from a patio or path, but give its growth a defined destination and room to develop.
Space Trumpet Vine 8 ft apart, measured center to center (2.4 m).
The mature spread is about 10 ft (3 m), so plants set at that distance grow together into continuous cover.
Treat 8 ft as a planning baseline — cultivar and local growing conditions shift the final footprint.
Place Campsis radicans at the base of a substantial arbor, pergola, freestanding trellis, or large wall section that can carry a mature woody vine. Its aerial rootlets grip vertical surfaces, so keep it away from delicate finishes and wood siding. Make the support part of the plan from the start, with an open approach for pruning and for reaching the base without stepping through nearby planting.[1][2]
Set plants 8 feet apart, center to center, when repeating them along a long support. Each vine can ultimately occupy about 10 feet of lateral space, so let the canopy overlap only where a continuous screen is intended. Reserve a broad planting strip at the base rather than squeezing it between a structure and a narrow path; the mature framework needs clear access for training and containment.
Use a full-sun position to support the strongest flower display, ideally with some shelter from cold winds. Its low-water needs suit a bed that is not routinely irrigated once established, but avoid ground that remains wet or flooded. Keep the root zone outside the cramped, heavily trafficked edge of a path so the base can be maintained without disturbing surrounding plants.[1][3]
The main floral display runs from summer into early fall, when the vine can make a tall support a focal point in the garden. It loses its foliage in winter, leaving the support and woody stems visually exposed. Plan the structure and nearby evergreen or architectural elements to carry the scene outside the flowering season.[2]
Treat containment as an ongoing design task, not a one-time planting detail. Trumpet vine can spread by underground runners and seed into adjacent ground, so avoid placing it beside small ornamental beds or areas where shoots cannot be readily mown, removed, and monitored. Annual late-winter or early-spring pruning helps keep the vine assigned to its support and within its allotted space.[1][2]