Salix serpyllifolia

RHS Plant Profile
thyme-leaved willow

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thyme-leaved willow visionspictures.com

Synonyms

Salix retusa subsp. serpyllifolia

Plants for pollinators
Shrubs Alpine Rockery
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A creeping, deciduous alpine shrub with woody stems and very small, oval-shaped glossy dark green leaves. Small, golden yellow catkins appear after the leaves in spring

Position

Full sun

Soil Types

Clay, Loam, Sand, Chalk

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

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

Position

Full sun
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)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Salicaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Matforming, Spreading branched
Genus
Salix are deciduous shrubs and trees of diverse habit, with simple leaves and tiny flowers in catkins, male and female usually on separate plants. Some are valued for their brightly coloured winter shoots, others for their foliage or showy male catkins
Name Status
Correct

How to Grow

Cultivation

Thrives in any well drained soil in full sun

Propagation

Propagate by softwood cuttings in early summer or hardwood cuttings in winter

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Rock garden
  • Patio and container plants
  • Wildlife gardens

Pruning

Pruning group 1

Pests

May be susceptible to aphids, caterpillars, willow leaf beetle, sawflies and willow scale insects

Diseases

May be susceptible to willow anthracnose, honey fungus and rust diseases