Rough-surface aster Plant Care

Rough-surface aster (Aster ageratoides) belongs to the Asteraceae family within the Aster genus. Rough-surface aster is native to East Asia, China, Japan, Korea.

Rough-surface aster displays an upright, spreading growth habit, reaching up to 2 ft tall with a spread of approximately 1 ft. Rough-surface aster produces daisy-like flowers in various colors like purple, pink, white, and blue.

Leaf size: approximately 3 inches.

Water a young or newly planted Rough-surface aster every 7–14 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.

Rough-surface aster thrives in full sun.

Aster ageratoides tolerates temperatures of 50–75°F. Rough-surface aster prefers humidity levels of 40–60%.

Well-draining soil mix. Good drainage is essential for Rough-surface aster to prevent waterlogging, which leads to root rot and fungal issues.

Feed Rough-surface aster every month 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 and well-draining soil mix. Avoid low spots where water collects after rain.

Rough-surface aster is suited to USDA Zone 4a – 9b.

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.

Rough-surface aster can spread to about 1 ft (0.3 m) and reach about 2 ft (1 m) tall. Space plants about 1 ft (0.3 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 Rough-surface aster 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.

Rough-surface aster is hardy down to USDA zone 4a, so once established it can stay outdoors through winter in that zone and warmer ones.

Water deeply in late autumn before the ground freezes, and spread a 5–8 cm (2–3 in) layer of mulch over the root zone, keeping it away from the trunk.

Young and container-grown shrubs need extra protection: roots in a pot freeze much more easily than roots in the ground.

Rough-surface aster can be propagated through divide clumps in spring or fall. Similar propagation techniques also apply to altai aster plant care, which shares the same genus.

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

Rough-surface aster is susceptible to aphids, slugs, snails. 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.

Rough-surface aster grows outdoors in USDA Zone 4a – 9b. It survives winters down to planting zone 4a. Rough-surface aster is native to East Asia, China, Japan, Korea.