Ageratum oerstedii Plant Care

Ageratum oerstedii (Ageratum oerstedii) belongs to the Asteraceae family within the Ageratum genus.

Ageratum oerstedii displays a compact, mounding habit growth habit, reaching up to 0.5 ft tall with a spread of approximately 0.5 ft. Ageratum oerstedii produces small fluffy flowers in blue, pink, or white clusters.

Leaf size: approximately 2 inches.

Water a young or newly planted Ageratum oerstedii every 3–5 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established shrubs mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Ageratum oerstedii thrives in full sun to partial shade.

Ageratum oerstedii tolerates temperatures of 60–80°F. Ageratum oerstedii prefers humidity levels of 40–60%.

Well-draining, fertile soil with added organic matter. Good drainage is essential for Ageratum oerstedii to prevent waterlogging, which leads to root rot and fungal issues.

Feed Ageratum oerstedii every 4 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established shrubs 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, fertile soil with added organic matter. Avoid low spots where water collects after rain.

Ageratum oerstedii is suited to USDA Zone 13a.

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

Ageratum oerstedii can spread to about 1 ft (0.2 m) and reach about 1 ft (0 m) tall. Space plants about 1 ft (0.2 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 plant spacing calculator.

Prune Ageratum oerstedii 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 shrub in one year.

Ageratum oerstedii 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.

Ageratum oerstedii can be propagated through seeds.

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

Ageratum oerstedii is susceptible to aphids, spider mites. 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.

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