Helichrysum thianschanicum 'White Wonder'

RHS Plant Profile
silver spike 'White Wonder'

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An upright, mound-forming tender evergreen sometimes grown as an annual with aromatic silver-grey leaves. Clusters of dense yellow flower heads are produced in summer

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
Moist but well–drained or Well–drained
pH
Alkaline or Neutral

Position

Full sun
Aspect
East–facing or South–facing or West–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)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asteraceae
Native to GB/Ireland
No
Foliage
Semi evergreen
Habit
Bushy
Genus
Helichrysum can be annuals, herbaceous or evergreen perennials or shrubs, usually with grey-hairy foliage and papery everlasting flower-heads
Name Status
Unresolved

How to Grow

Cultivation

Grow in well drained, poor to moderately fertile neutral to alkaline soil in full sun. Will need winter protection from the cold and wet

Propagation

Propagate by semi-ripe cuttings in summer

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Low Maintenance
  • Flower borders and beds

Pruning

Pruning group 10. Prune in early spring, do not cut back into old wood.

Pests

Generally pest-free

Diseases

May be susceptible to honey fungus in gardens where it is present but insufficient data to determine degree of susceptibility. May also be susceptible to downy mildews and powdery mildews