Scarlet Mallow Plant Care

Scarlet Mallow (Pentapetes phoenicea) belongs to the Malvaceae family within the Pentapetes genus. Scarlet Mallow is also known as Midday Flower.

Scarlet Mallow displays an upright, branching shrub growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Scarlet Mallow produces showy, large, bright red flowers with yellow centers.

Leaf size: approximately 6 inches.

Water a young or newly planted Scarlet Mallow 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.

Scarlet Mallow thrives in full sun to partial shade.

Pentapetes phoenicea tolerates temperatures of 65–80°F. Scarlet Mallow prefers humidity levels of 40–60%.

Well-draining loamy soil with added organic matter for moisture retention. Good drainage is essential for Scarlet Mallow to prevent waterlogging, which leads to root rot and fungal issues.

Feed Scarlet Mallow 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 full sun to partial shade and well-draining loamy soil with added organic matter for moisture retention. Avoid low spots where water collects after rain.

Scarlet Mallow is suited to USDA Zone 13b.

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.

Scarlet Mallow can spread to about 2 ft (0.6 m) and reach about 3 ft (1 m) tall. Space plants about 2 ft (0.6 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 Scarlet Mallow 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.

Scarlet Mallow 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.

Scarlet Mallow can be propagated through seeds, stem cuttings.

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

Scarlet Mallow 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.

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