Three-ridged Calanthe Plant Care

Three-ridged Calanthe (Calanthe tricarinata) belongs to the Orchidaceae family within the Calanthe genus. Three-ridged Calanthe is native to Japan, Korea, China, Northeastern India, Pakistan, Bhutan, Assam, Nepal, Kashmir, Myanmar and Thailand. Three-ridged Calanthe is also known as Three-keeled Calanthe.

Three-ridged Calanthe displays an upright, clumping orchid growth habit, reaching up to 1.5 ft tall with a spread of approximately 1 ft. Three-ridged Calanthe produces colorful, showy orchid blooms in various shades.

Leaf size: approximately 8 inches.

Water a young or newly planted Three-ridged Calanthe 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.

Three-ridged Calanthe thrives in bright indirect to filtered sunlight. Avoid placing Three-ridged Calanthe in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Calanthe tricarinata tolerates temperatures of 60–80°F. Three-ridged Calanthe prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Loose, well-draining orchid mix with bark and perlite. Good drainage is essential for Three-ridged Calanthe to prevent waterlogging, which leads to root rot and fungal issues.

Feed Three-ridged Calanthe 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 to filtered sunlight and loose, well-draining orchid mix with bark and perlite. Avoid low spots where water collects after rain.

Three-ridged Calanthe is suited to USDA Zone 6b – 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.

Three-ridged Calanthe can spread to about 1 ft (0.3 m) and reach about 2 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 Three-ridged Calanthe 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.

Three-ridged Calanthe is hardy down to USDA zone 6b, 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.

Three-ridged Calanthe can be propagated through division, back bulbs, seedlings. Similar propagation techniques also apply to calanthe densiflora plant care, which shares the same genus.

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

Three-ridged Calanthe is susceptible to aphids, spider mites, scale insects. 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.

Three-ridged Calanthe grows outdoors in USDA Zone 6b – 9b. It survives winters down to planting zone 6b. Three-ridged Calanthe is native to Japan, Korea, China, Northeastern India, Pakistan, Bhutan, Assam, Nepal, Kashmir, Myanmar and Thailand.