Common mallow
Also known as
High mallow, Tall mallow, Wood mallow, Cheeses plant, Mallow
Keep this plant’s care guide close at hand.
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Malva sylvestris, commonly called common mallow or high mallow, is a short-lived perennial (often grown as a biennial) in the mallow family, Malvaceae. It forms upright, branching clumps 60–120 cm tall with rounded, shallowly lobed, softly hairy leaves on long petioles. From late spring into autumn, it produces abundant, satiny five-petaled flowers in pink to purple-magenta with conspicuous darker veining, typically 3–5 cm across, borne in leaf axils and beloved by bees and butterflies. The plant is adaptable, thriving in moderately fertile to poor soils, including calcareous sites, provided drainage is good. It tolerates drought once established and self-seeds readily, naturalizing in disturbed places. Leaves and flowers are edible, mildly mucilaginous, and traditionally used as soothing demulcents. In gardens, it suits cottage borders, meadows, and wildlife plantings, and can be grown in large containers. Regular deadheading or a midseason shear prolongs bloom and maintains a tidy habit. Expect some winter dieback in cold climates, with regrowth from the crown or self-sown seedlings the following season.
Taxonomy
Properties & Requirements
How to care for Common mallow
Water
Once established, common mallow is fairly drought tolerant. Water deeply when the top 2–3 cm of soil is dry, aiming for about 2.5 cm (1 inch) of water per week during hot, dry periods. Allow the soil to dry slightly between waterings to prevent root problems; avoid waterlogging. Container-grown plants dry faster—check with a finger and water until excess drains, then empty saucers. A 2–5 cm organic mulch conserves moisture and moderates soil temperature while keeping the crown dry.
Light
Full sun (6+ hours daily) produces the sturdiest stems and most abundant bloom. Plants tolerate light or dappled shade—especially in hot climates—though flowering may diminish and stems may lean. In containers or on balconies, place in the brightest exposure available (south or west) and rotate periodically for even growth. Avoid deep shade and heavily overhung sites. Ensure good air circulation in dense plantings to help minimize rust and other leaf diseases under humid conditions.
Nutrients
Malva sylvestris is not a heavy feeder. Incorporate well-rotted compost into planting soil and top-dress each spring. In the ground, a light application of a balanced fertilizer (e.g., 5-5-5 or 10-10-10) at half strength in late spring is sufficient; excess nitrogen encourages lanky, disease-prone growth. In containers, use a slow-release, balanced fertilizer at label rates or feed monthly at half strength during active growth. Maintain even moisture after feeding and avoid high-salt products on drought-stressed plants.
Temperature
Hardy in USDA Zones 5–9, Malva sylvestris tolerates light to moderate frost; top growth may die back but crowns often resprout. Optimal growth occurs in mild conditions around 15–27°C. During prolonged heat (>32°C), provide consistent moisture and, in very hot regions, light afternoon shade. Container plants are more vulnerable to freezing; insulate or move to a sheltered spot when temperatures approach −10°C. Avoid cool, stagnant, humid conditions that favor foliar diseases such as rust and leaf spots.
