Great Mullein

Verbascum thapsus, known as great mullein or common mullein, is a stately biennial herb native to Europe, northern Africa, and Asia. In its first year it forms a dramatic rosette of large, silver-grey felted leaves; in its second year it sends up a towering flower spike reaching 150 cm or more, studded with small yellow flowers. It thrives in full sun and tolerates poor, dry soils with ease. The plant has a long history of medicinal use and self-seeds prolifically once established.

Growing

Sow seeds directly outdoors onto the soil surface or to a depth of just 0.2 cm — seeds need light to germinate well. Sow when soil reaches around 10 °C. Germination takes 15–30 days. Thin or transplant seedlings to 30–40 cm apart in the row, with rows 75–100 cm apart. No indoor start is required; direct sowing in a sunny, open position gives the best results.

Care

Water young rosettes during dry spells to help establishment; once mature the plant is highly drought-tolerant and needs little supplemental irrigation. No feeding is necessary on average garden soils — avoid rich compost, which encourages lush foliage at the expense of the flower spike. No staking needed. Remove spent flower spikes before seed sets if you wish to limit self-seeding, or leave them to naturalise freely.

Harvest

Harvest individual flowers as they open along the spike — they are short-lived, so check daily. Leaves can be harvested from the first-year rosette at any point before the flower spike emerges. For medicinal use, collect flowers on dry days when fully open. The harvest window across the full spike extends roughly 60 days as flowers open progressively from the base upward.

In the kitchen

Great mullein is used primarily as a medicinal herb. Flowers are steeped in olive oil to make traditional ear-drop infusions, or dried for use in teas targeting respiratory complaints. Leaves, dried and crumbled, can be added to herbal smoking blends or prepared as a throat-soothing infusion. The flowers are edible and can be scattered on salads as a decorative garnish.

Storing

Dry flowers in a single layer on a mesh rack in a warm, well-ventilated spot away from direct light; store in airtight glass jars for up to 12 months. Dry leaves in the same way, crumble once fully dry, and store in sealed containers for up to 1 year. Flower-infused oil keeps for 4–6 weeks at room temperature or up to 3 months refrigerated.