Helianthemum, Common Rock Rose, Sun Rose 'Wisley Primrose'

Helianthemumnummularium

Genus
Helianthemum (hee-lee-AN-thee-mum)
Species
nummularium (num-ew-LAH-ree-um)
Synonym
Sun Exposure
Full Sun
Sun to Partial Shade
Foliage
Evergreen
Height
6-12 in. (15-30 cm)
Spacing
36-48 in. (90-120 cm)
Hardiness
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)
Bloom Color
Bright Yellow
Bloom Time
Mid Spring
Late Spring/Early Summer
Other Details
Category
Groundcovers
Water Requirements
Drought-tolerant; suitable for xeriscaping
Foliage Color
Where to Grow
Can be grown as an annual
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information
Non-patented
Propagation Methods
By dividing the rootball
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost
Seed Collecting
Regional

This plant is said to grow outdoors in the following regions:

ALLEGHANY, California

Bellingham, Washington

Stanwood, Washington

Vancouver, Washington

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Gardener's Notes:

1
positive
1
neutral
0
negative
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B
Cedarhome, WA (Zone 8b) | November 2009 | positive

Low maintenance plant, blooms over a long period of time. I shear it back about mid-summer. Nice combo with sedums in a hot spot.

S
Oklahoma City, OK (Zone 7a) | May 2004 | neutral

This cultivar is noted for its gray foliage and bright yellow flowers with with small yellow stamens at the center. Plant in a location w...Read More

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