Helianthemum oelandicum subsp. incanum

RHS Plant Profile
hoary rock rose

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Other common names

haory-leaved sun rose, slender trailing sun rose

Synonyms

Helianthemum canum
Helianthemum canum subsp. balcanicum

Shrubs
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A compact, low growing, broadly spreading sub-shrub with hairy, evergreen leaves. In spring and early summer it produces bright-yellow five-petalled flowers on thin stems.

Position

Full sun

Soil Types

Chalk, Sand, Loam

Max Height

Up to 10 cm

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
Up to 10 cm

Growing Conditions

Chalk Sand Loam
Moisture
Well–drained
pH
Neutral or Alkaline

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)
H5
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Cistaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Spreading branched
Genus
Helianthemum are bushy or spreading evergreen shrubs with small paired leaves and saucer-shaped flowers borne in short racemes in spring and early summer
Name Status
Correct
Plant Range
Europe, SW Asia

How to Grow

Cultivation

Grow in moderately fertile or poor well-drained neutral to alkaline soil in full sun.

Propagation

Propage by seed using ripe seeds of species in a cold frame in autumn. Propagate by softwood cuttings in late spring or early summer.

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Gravel garden
  • Banks and slopes
  • Flower borders and beds

Pruning

Cut back lightly after flowering flowering in mid- to late summer. Prune stems individually rather than shearing over the entire plant.

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