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Moth Mullein

Verbascum blattaria

Also listed as Blattaria vulgaris, Thapsus blattaria

Also known as White Moth Mullein, White Mullein

herbaceous☀️ full sun💧 low water❄ Hardy: Zone 3a – Zone 9b

Climate Match for your location

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Moth mullein is a tall, slender biennial or short-lived perennial with distinctive pale yellow or white flowers arranged in a loose spike. It thrives in poor, dry soils and is valued for its delicate blooms and architectural form in cottage gardens.

Why grow it

Moth mullein offers a lighter, more delicate alternative to common mullein species, with thinner flower spikes and a less robust habit that suits cottage garden settings where sculptural restraint is preferred. Unlike heavier-stemmed relatives, it performs well in truly poor and dry soils where few other biennials establish reliably, making it useful for stabilizing marginal areas without soil amendment. Its pale flowers attract pollinators while the plant's biennial cycle means it typically self-seeds modestly rather than dominating a space.

Watch out for

Seedlings benefit from stratification or cold exposure to break dormancy, so autumn sowing often outperforms spring planting in most climates. The plant can take two seasons to flower if conditions are suboptimal, and flowering stems are relatively thin and may require staking in windy sites or rich soils where growth becomes leggy. In wetter climates, fungal issues can affect foliage, so good drainage and air circulation are more important here than in drier regions where the species excels.

Overview

Form
Upright
Growth Rate
moderate
Size
2–4′ tall × 1–1.5′ wide
Dormancy
deciduous
Family
Scrophulariaceae

Native Range

Mediterranean

Seasonality

Bloom Season

J
F
M
A
M
J
J
A
S
O
N
D

Season of Interest

Summer

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Companion Planting

Plants well with