Buddleja macrostachya Plant Care

Buddleja macrostachya (Buddleja macrostachya) belongs to the Scrophulariaceae family within the Buddleja genus.

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

Leaf size: approximately 6 inches.

Water a young or newly planted Buddleja macrostachya 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.

Buddleja macrostachya thrives in full sun to partial shade.

Buddleja macrostachya tolerates temperatures of 50–80°F. Buddleja macrostachya prefers humidity levels of 40–70%.

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

Feed Buddleja macrostachya 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.

Buddleja macrostachya 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.

Buddleja macrostachya 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 Buddleja macrostachya 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.

Buddleja macrostachya 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.

Buddleja macrostachya 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.

Buddleja macrostachya 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.

Buddleja macrostachya grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Buddleja macrostachya as a houseplant or bring it indoors before the first frost.