Verbascum nigrum var. album

RHS Plant Profile

white-flowered black mullein

Herbaceous Perennial

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A rosette-forming, deciduous or semi-evergreen perennial about 90cm tall, with scalloped, long-stalked, mid to dark green leaves, slightly grey-woolly beneath, making basal clumps that produce slender racemes of pure white flowers with purple stamens at their centres, from midsummer to early autumn

Position

Full sun, Partial shade

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 1–2 years
Max Spread: 0.1-0.5 metres
Max Height: 0.5-1 metres

Growing Conditions

Chalk Loam Sand

Moisture: Well–drained
pH: Alkaline or Neutral

Position

Full sun Partial shade

Aspect: East–facing or South–facing or West–facing
Exposure: Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H6

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Scrophulariaceae
Native to GB/Ireland: No
Foliage: Deciduous, Semi evergreen
Habit: Clump forming
Genus: Verbascum can be annuals, biennials, perennials or subshrubs mostly with hairy leaves and 5-petalled, saucer-shaped flowers
Name Status: Correct

How to Grow

Cultivation

Usually found on calcareous, free-draining sites or disturbed ground in a sunny location. Mulleins are beneficial to wildlife as a pollen and nectar source when in flower, seeds are a food source for birds and in winter hollow stems act as a refuge for insects

Propagation

Propagate by seed or by root cuttings in winter

Suggested planting locations and garden types

Cottage and informal garden
Wildflower meadow
Wildlife gardens

Pruning

Faded flower stems can be cut back in late autumn or in spring before new growth starts emerging

Pests

May be susceptible to mullein moth

Diseases

Generally disease-free