Alphabetical Plant Listing

Helianthemum nummularium (Rock Rose)

Rock Rose


Covered with abundant, showy rose-like flowers in shades of orange, pink, yellow and white in late spring to early summer, Helianthemum nummuralium (Rock Rose) is a charming low-growing subshrub with an evergreen foliage of gray-green, lance-shaped leaves. Each flower opens for only one day, but new buds keep opening - enabling a long lasting display (up to 2 months).

  • This low-growing plant grows only 6-12 in. tall (15-30 cm) and spreads 24-36 in. (60-90 cm).
  • Best in full sun ;in dry, sandy or rocky, alkaline, well-drained soils. This plant prefers cool summers and warm winters and is not reliably hardy in USDA zone 5. Drought tolerant.
  • Great choice for rock gardens, coastal gardens, cottage gardens, as edging plant, ground cover or for your border fronts. Lovely on a stone wall for a cascading effect.
  • Shear plants after flowering to shape and to promote new growth.
  • Propagate by softwood cuttings in late spring or early summer
  • Generally pest and disease free
  • Native to most of Europe.

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Requirements

Hardiness 6 – 8
Heat Zones 6 – 8
Climate Zones 1, 2, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Shrubs
Plant Family Helianthemum - Rock Roses
Exposure Full Sun
Season of Interest Spring (Late)
Summer (Early)
Height 6" – 1' (15cm – 30cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 24" – 36" (60cm – 90cm)
Water Needs Low, Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Showy, Evergreen
Native Plants United Kingdom
Tolerance Drought, Dry Soil, Rocky Soil
Garden Uses Banks and Slopes, Edging, Ground Covers
Garden Styles Coastal Garden, Gravel and Rock Garden, Informal and Cottage

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While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 6 – 8
Heat Zones 6 – 8
Climate Zones 1, 2, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Shrubs
Plant Family Helianthemum - Rock Roses
Exposure Full Sun
Season of Interest Spring (Late)
Summer (Early)
Height 6" – 1' (15cm – 30cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 24" – 36" (60cm – 90cm)
Water Needs Low, Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Showy, Evergreen
Native Plants United Kingdom
Tolerance Drought, Dry Soil, Rocky Soil
Garden Uses Banks and Slopes, Edging, Ground Covers
Garden Styles Coastal Garden, Gravel and Rock Garden, Informal and Cottage

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