Marrubium vulgare 'Green Pompon'

RHS Plant Profile
white horehound 'Green Pompon'

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white horehound 'Green Pompon' RHS

Synonyms

Marrubium vulgare 'Pompon'

Herbaceous Perennial

A hardy perennial which forms spreading clumps of rounded, densely hairy, grey-green leaves. Upright stems carry tight whorls of small, white flowers surrounded by longer-lasting, green bracts

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
0.1-0.5 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
East–facing or South–facing or North–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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Lamiaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
A genus of herbaceous flowering plants, closely related to mint, with aromatic, oval-shaped, grey-green, hairy wrinkled foliage and white flowers which appear on the upper part of the stem
Name Status
Accepted

How to Grow

Cultivation

Grows in any reasonable garden soil, in sun or semi-shade. Best suited to wild areas

Propagation

Propagate by division

Suggested planting locations and garden types

  • Cottage and informal garden
  • Wildlife gardens
  • Banks and slopes
  • Flower borders and beds
  • Underplanting of roses and shrubs

Pruning

No pruning required, spent flower stems can be cut back in autumn

Pests

May be susceptible to aphids

Diseases

May be susceptible to powdery mildews