Cyananthus macrocalyx Plant Care

Cyananthus macrocalyx (Cyananthus macrocalyx) belongs to the Campanulaceae family within the Cyananthus genus. Cyananthus macrocalyx is native to central and western China, Nepal, Myanmar, and the Assam region of India.

Cyananthus macrocalyx displays a low rosette, spreading growth habit, reaching up to 0.5 ft tall with a spread of approximately 1 ft. Cyananthus macrocalyx produces small bell-shaped flowers in shades of blue, purple, or white.

Leaf size: approximately 2 inches.

Water a young or newly planted Cyananthus macrocalyx every 7–10 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.

Cyananthus macrocalyx thrives in bright indirect light. Avoid placing Cyananthus macrocalyx in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Cyananthus macrocalyx tolerates temperatures of 50–75°F. Cyananthus macrocalyx prefers humidity levels of 40–70%.

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

Feed Cyananthus macrocalyx every 6 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 bright indirect light and well-draining sandy loam with added organic matter for moisture retention. Avoid low spots where water collects after rain.

Cyananthus macrocalyx is suited to USDA Zone 5a – 8b.

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.

Cyananthus macrocalyx can spread to about 1 ft (0.3 m) and reach about 1 ft (0 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 Cyananthus macrocalyx 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.

Cyananthus macrocalyx is hardy down to USDA zone 5a, 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.

Cyananthus macrocalyx can be propagated through seeds, division of clumps. Similar propagation techniques also apply to hooker's bellflower plant care, which shares the same genus.

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

Cyananthus macrocalyx is susceptible to aphids, spider mites, whiteflies. 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.

Cyananthus macrocalyx grows outdoors in USDA Zone 5a – 8b. It survives winters down to planting zone 5a. Cyananthus macrocalyx is native to central and western China, Nepal, Myanmar, and the Assam region of India.