Annual Mallow Plant Care

Annual Mallow (Malva trimestris) belongs to the Malvaceae family within the Malva genus. Annual Mallow is native to the Mediterranean region. Annual Mallow is also known as Three-month Mallow.

Annual Mallow displays an upright, bushy shrub growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Annual Mallow produces showy, saucer-shaped flowers in various colors.

Leaf size: approximately 4 inches.

Water a young or newly planted Annual Mallow every 5–7 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.

Annual Mallow thrives in full sun to partial shade.

Malva trimestris tolerates temperatures of 60–80°F. Annual Mallow prefers humidity levels of 40–60%.

Well-draining loamy soil with added compost for nutrients. Good drainage is essential for Annual Mallow to prevent waterlogging, which leads to root rot and fungal issues.

Feed Annual 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 compost for nutrients. Avoid low spots where water collects after rain.

Annual Mallow is suited to USDA Zone 13a.

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.

Annual 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 Annual 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.

Annual 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.

Annual Mallow can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to egyptian mallow plant care, which shares the same genus.

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Annual 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.

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