Common Mullein Plant Care

Common Mullein (Verbascum thapsus) belongs to the Scrophulariaceae family within the Verbascum genus. Common Mullein is native to Europe, northern Africa, and Asia, and introduced in the Americas, Australia and New Zealand. Common Mullein is also known as Great Mullein, Woolly Mullein, Flannel Mullein.

Common Mullein displays a tall spires of flowers growth habit, reaching up to 4 ft tall with a spread of approximately 2 ft. Common Mullein produces large, showy spikes of yellow, pink, or purple flowers.

Leaf size: approximately 6 inches.

Water a young or newly planted Common Mullein every 7–14 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.

Common Mullein thrives in full sun to part shade.

Verbascum thapsus tolerates temperatures of 50–80°F. Common Mullein prefers humidity levels of 40–70%.

Well-draining sandy loam with added compost for nutrients. Good drainage is essential for Common Mullein to prevent waterlogging, which leads to root rot and fungal issues.

Feed Common Mullein 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 part shade and well-draining sandy loam with added compost for nutrients. Avoid low spots where water collects after rain.

Common Mullein is suited to USDA Zone 3 – 9.

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.

Common Mullein can spread to about 2 ft (0.6 m) and reach about 4 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 Common Mullein 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.

Common Mullein is hardy down to USDA zone 3, 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.

Common Mullein can be propagated through seeds, division of offsets. Similar propagation techniques also apply to bombyciferum mullein plant care, which shares the same genus.

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

Common Mullein is susceptible to aphids, slugs, snails. 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.

Common Mullein grows outdoors in USDA Zone 3 – 9. It survives winters down to planting zone 3a. Common Mullein is native to Europe, northern Africa, and Asia, and introduced in the Americas, Australia and New Zealand.