American butterfly bush Plant Care

American butterfly bush (Buddleja americana) belongs to the Scrophulariaceae family within the Buddleja genus. American butterfly bush is native to the Americas, its range extending south from Tamaulipas, Mexico, through Central America and much of the West Indies into South America, reaching eastward to Venezuela, westward as far as the Galapagos, and south to Bolivia. American butterfly bush is also known as South American butterfly bush.

American butterfly bush displays a fast-growing shrub growth habit, reaching up to 6 ft tall with a spread of approximately 4 ft. American butterfly bush produces showy clusters of fragrant flowers in various colors.

Leaf size: approximately 6 inches.

Water a young or newly planted American butterfly bush every 7–10 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.

American butterfly bush thrives in full sun to partial shade.

Buddleja americana tolerates temperatures of 50–80°F. American butterfly bush prefers humidity levels of 40–70%.

Well-draining sandy loam with added organic matter. Good drainage is essential for American butterfly bush to prevent waterlogging, which leads to root rot and fungal issues.

Feed American butterfly bush every 4 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 sandy loam with added organic matter. Avoid low spots where water collects after rain.

American butterfly bush is suited to USDA Zone 12a.

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.

American butterfly bush can spread to about 4 ft (1.2 m) and reach about 6 ft (2 m) tall. Space plants about 4 ft (1.2 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 American butterfly bush 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.

American butterfly bush is frost-tender (hardy to USDA zone 12). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

American butterfly bush can be propagated through softwood cuttings, hardwood cuttings. Similar propagation techniques also apply to himalayan butterfly bush plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

American butterfly bush is susceptible to aphids, spider mites, caterpillars. 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.

American butterfly bush grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. American butterfly bush is native to the Americas, its range extending south from Tamaulipas, Mexico, through Central America and much of the West Indies into South America, reaching eastward to Venezuela, westward as far as the Galapagos, and south to Bolivia. In cooler regions, grow American butterfly bush as a houseplant or bring it indoors before the first frost.