Alyssum saxatile 'Summit'

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An evergreen, mound-forming perennial to 20cm tall, with rosetted, grey-green leaves. In spring it produces a profusion of yellow flowers held in dense clusters above the foliage. Drought tolerant once established, and an RHS Plant for Pollinators

Position

Full sun

Soil Types

Chalk, Clay, 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

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

Position

Full sun
Aspect
South–facing or West–facing or East–facing
Exposure
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
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Brassicaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Bushy
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
Accepted

How to Grow

Cultivation

Grow in moderately fertile, well-drained soil in full sun

Propagation

Propagate by sowing seed in containers in a cold frame in autumn, or by softwood cuttings in early summer

Suggested planting locations and garden types

  • Cottage and informal garden
  • Rock garden
  • Wildlife gardens
  • Banks and slopes
  • Garden edging

Pruning

Trim plants back by a half after flowering to maintain a compact shape

Pests

May be susceptible to aphids

Diseases

Generally disease-free