Yellow Trumpetbush Plant Care

Yellow Trumpetbush (Cybistax antisyphilitica) belongs to the Bignoniaceae family within the Cybistax genus. Yellow Trumpetbush is also known as Yellow Trumpet Tree, Yellow Tabebuia.

Yellow Trumpetbush displays a tall, upright tree growth habit, reaching up to 30 ft tall with a spread of approximately 15 ft. Yellow Trumpetbush produces showy trumpet-shaped flowers in shades of orange and red.

Leaf size: approximately 6 inches.

Water a young or newly planted Yellow Trumpetbush every 7–14 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established trees mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Yellow Trumpetbush thrives in full sun to partial shade.

Cybistax antisyphilitica tolerates temperatures of 60–85°F. Yellow Trumpetbush prefers humidity levels of 40–70%.

Well-draining loamy soil with added organic matter for nutrients. Good drainage is essential for Yellow Trumpetbush to prevent waterlogging, which leads to root rot and fungal issues.

Feed Yellow Trumpetbush every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established trees in good soil often need little extra feeding, so let weak growth or pale foliage guide you.

Stop feeding by late summer so new growth can harden before winter.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Choose a spot with full sun to partial shade and well-draining loamy soil with added organic matter for nutrients. Avoid low spots where water collects after rain.

Yellow Trumpetbush is suited to USDA Zone 13a.

Plant container-grown or balled-and-burlapped trees in spring or early autumn, setting the root flare at soil level, and water well after planting.

Yellow Trumpetbush can spread to about 15 ft (4.6 m) and reach about 30 ft (9 m) tall. Space plants about 15 ft (4.6 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.

Planning a row or hedge? Try the tree spacing calculator.

Prune Yellow Trumpetbush while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.

If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the tree in one year.

Yellow Trumpetbush is frost-tender (hardy to USDA zone 13). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Yellow Trumpetbush can be propagated through seeds, stem cuttings.

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Yellow Trumpetbush is susceptible to aphids, scale insects. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Yellow Trumpetbush grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. In cooler regions, grow Yellow Trumpetbush as a houseplant or bring it indoors before the first frost.