Red crusea Plant Care

Red crusea (Crusea coccinea var. coccinea) belongs to the Rubiaceae family within the Crusea genus. Red crusea is native to Australia. Red crusea is also known as Scarlet flame pea.

Red crusea displays a compact, mounding shrub growth habit, reaching up to 2.5 ft tall with a spread of approximately 3 ft. Red crusea produces small, fragrant white flowers in clusters.

Leaf size: approximately 4 inches.

Water a young or newly planted Red crusea 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.

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

Crusea coccinea var. coccinea tolerates temperatures of 65–80°F. Red crusea prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Moist, well-draining peat-based soil mix with added perlite for aeration. Good drainage is essential for Red crusea to prevent waterlogging, which leads to root rot and fungal issues.

Feed Red crusea 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 moist, well-draining peat-based soil mix with added perlite for aeration. Avoid low spots where water collects after rain.

Red crusea is suited to USDA Zone 9a – 11b.

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.

Red crusea can spread to about 3 ft (0.9 m) and reach about 3 ft (1 m) tall. Space plants about 3 ft (0.9 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 Red crusea 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.

Red crusea is frost-tender (hardy to USDA zone 9). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Red crusea can be propagated through softwood cuttings, air layering. Similar propagation techniques also apply to scarlet bush plant care, which shares the same genus.

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

Red crusea is susceptible to spider mites, scale insects, mealybugs. 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.

Red crusea grows outdoors in USDA Zone 9a – 11b. It survives winters down to planting zone 9a. Red crusea is native to Australia. In cooler regions, grow Red crusea as a houseplant or bring it indoors before the first frost.