Plants
Mullein
Verbascum · Scrophulariaceae
Mullein is the cathedral of the natural garden: from a silvery, felted leaf rosette, a flower spire up to two metres tall rises in the second year, opening golden-yellow blooms for weeks on end. Wild bees and bumblebees work it from morning to night. See a mullein in evening light just once and the royal name explains itself.
- Light
- Full sun; it answers shady spots with weak, toppling spires.
- Watering
- Very low — the deep taproot fends for itself once established.
- Care level
- Easy
- Botanical
- Verbascum
The best-known species is the large-flowered mullein (Verbascum densiflorum), whose blooms are traditionally used in cough tea. Alongside it stand the silver-leaved Verbascum bombyciferum, which looks coated in felt, and the purple mullein (Verbascum phoeniceum) in violet and pink. Modern hybrids like the Cotswold varieties bring apricot and salmon tones in a lower, more perennial form.
Important for understanding: the classic tall species are biennial. In the first year they form only the imposing leaf rosette; in the second year come flowering, seed ripening and then the end of the plant. If you want spires in the bed every year, simply let a few plants self-seed — mullein organises its own succession reliably and likes to pick surprising spots in the process.
The site is quickly explained: as sunny, dry and lean as possible. As a pioneer of rubble and gravel areas it roots deep and needs practically no water once established. Rich garden soil is actually a disadvantage — the spires then grow soft and topple in summer storms.
For the insect world, mullein is a powerhouse: the flowers supply pollen for wild bees and bumblebees, and the caterpillars of the mullein moth, a handsome night-flyer, feed on the leaves. Holes in the foliage are not damage here but a natural garden in action. Leave the spent, seed-bearing spires standing into winter for the birds.
In design terms, the vertical line is its trump card: among globe thistles, yarrow and grasses, mullein acts like an exclamation mark in the gravel bed. Dried, the spires keep their structure and work well in large autumn arrangements. A note on safety: flowers and leaves are considered harmless, but the seeds contain saponins — children should not be allowed to nibble on seed heads.
Is Mullein toxic to children and pets?
- Children
- Mildly irritating
- Cats
- Non-toxic
- Dogs
- Non-toxic
Mullein flowers and leaves are considered harmless — the flowers are even used traditionally in cough tea. The seeds, however, contain saponins and should not be eaten; the felted leaf hairs can also irritate sensitive skin and mucous membranes.
Typical symptoms: Eating larger amounts of seeds can cause stomach upset and nausea; the leaf hairs can cause skin irritation and a scratchy throat.
In an emergency:call the German poison control centre in Bonn on +49 228 19240 (24/7) — for pets, contact an emergency vet directly. This information does not replace medical or veterinary advice.
Overview: toxic & non-toxic plants for cats, dogs and children
Care
- 01Plant in full sun, warm and dry — the leaner the soil, the sturdier the spire.
- 02Do not feed, and water only in extreme drought; avoid waterlogging at all costs.
- 03Loosely stake tall spires in windy spots.
- 04Shorten spent main spires and side spires will often follow.
- 05Leave a few seed heads standing so the biennial species renews itself.
- 06Do not move first-year rosettes — the deep taproot does not tolerate transplanting.
Frequently asked
- Why does my mullein not flower in the first year?
- Because the classic species are biennial: the first year produces only the leaf rosette, the flower spire follows in the second year. That is not a fault but the normal life cycle. For continuous bloom, plant two year-groups side by side or let the plants self-seed.
- Is mullein toxic to children or pets?
- Flowers and leaves are considered non-toxic; the flowers are even an old remedy for coughs. Caution applies only to the seeds, which contain saponins, and to the felted hairs, which can irritate skin and mucous membranes. For cats and dogs the plant is unproblematic.
- Can mullein flowers really be used as tea?
- Yes, the flowers of large-flowered and small-flowered mullein are a traditional cough remedy and officially recognised as a medicinal herb — their mucilage soothes irritation. Only the yellow petals are used, fresh or dried. As always for home use: only use clearly identified, untreated plants.
- Something is eating holes in my mullein leaves — what should I do?
- Very likely the strikingly yellow-and-black caterpillars of the mullein moth, a protected night-flyer. A healthy plant shrugs off the feeding without trouble and flowering barely suffers. We advise tolerating the caterpillars — they belong to mullein just as bumblebees belong to its flowers.