Alyssum montanum

RHS Plant Profile
mountain madwort

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mountain madwort Catherine Lewis
Alpine Rockery
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An evergreen, prostrate perennial with small, hairy, grey leaves. Spherical flowerheads of soft yellow, scented flowers are borne in summer. Height to 15cm

Position

Full sun

Soil Types

Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Loam Sand
Moisture
Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing or East–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

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Brassicaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Matforming
Genus
Alyssum can be annuals or evergreen perennials or sub-shrubs, with simple leaves and short racemes of small, 4-petalled yellow or white flowers in early summer
Name Status
Correct
Plant Range
Europe

How to Grow

Cultivation

Prefers a sunny, well-drained situation; ideally suited to rock garden conditions

Propagation

Propagate by softwood cutting or by propagate by seed

Suggested planting locations and garden types

  • Rock garden

Pruning

Cut back lightly after flowering

Pests

Generally pest-free

Diseases

Generally disease-free