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Great mullein

Verbascum thapsus · Scrophulariaceae

The gardener's calendar

The right move for September

Ideal time to plant great mullein: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Common name
Mullein
Family
Scrophulariaceae
Type
Biennial herbaceous plant
Mature height
80 cm to 2 m
Flowering
June to September
Exposure
Full sun
Hardiness
Very hardy (-20°C and below)
Origin
Europe, Western Asia

Care

Exposure

Mullein thrives in full sun, where it flowers generously. It tolerates partial shade but flowering will be less abundant. Plant it in an open, well-exposed location for optimal growth.

Soil and planting

This plant loves well-drained soil, even poor and rocky ground. It adapts well to dry, rocky terrain. Avoid compacted or overly moist soils that promote rot. Sow directly in place in autumn or spring.

Watering

Once established, mullein requires little watering and tolerates drought well. Water moderately during the growing period, especially young plants. Reduce watering once the leaves form.

Pruning and maintenance

Cut back faded flower spikes to extend blooming and limit self-seeding. At the end of the season, cut the stems to ground level. No structural pruning is necessary; this plant grows naturally in a columnar form.

Fertilization

Mullein requires no fertilizer. A light application of compost at planting time is more than sufficient. On very poor soils, a bit of organic matter in autumn can improve growth, but it's not essential.

Diseases and pests

This robust plant is rarely subject to diseases. Overly moist soils can cause rot. Watch for aphids early in the season, which can be treated with a water spray. Otherwise, it requires little phytosanitary monitoring.

Did you know?

Mullein was traditionally used in folk medicine to soothe coughs and respiratory complaints; the yellow flowers were even steeped in oil to make ointments. Its French name "bouillon" comes from its velvety appearance, while the cultivar "thapsus" refers to the ancient island of Thasos, from which the plant was supposedly imported.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.