Helianthemum Species, Common Rock Rose, Sun Rose

Helianthemumnummularium

Genus
Helianthemum (hee-lee-AN-thee-mum)
Species
nummularium (num-ew-LAH-ree-um)
Synonym
Sun Exposure
Full Sun
Foliage
Evergreen
Succulent
Height
12-18 in. (30-45 cm)
Spacing
18-24 in. (45-60 cm)
Hardiness
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
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)
Bloom Color
Red
Orange
Bright Yellow
White/Near White
Bloom Time
Late Spring/Early Summer
Other Details
Category
Shrubs
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Bronze
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
Patent Information
Non-patented
Propagation Methods
From seed; direct sow outdoors in fall
Seed Collecting
Regional

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

ALLEGHANY, California

Hercules, California

Lafayette, California

Farmington, New Mexico

Bend, Oregon

Barto, Pennsylvania

Staunton, Virginia

Pasco, Washington

Spokane, Washington

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Gardener's Notes:

1
positive
2
neutrals
0
negative
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B
Spokane, WA | March 2007 | positive

Ive had this plant for three years now. I have the Annabel variety, which has double blooms. Mine has formed a small six inch mound. I...Read More

P
(Zone 8b) | September 2004 | neutral

This plant enjoys a well drained soil and a light sheer after flowering to do away with the deadheads. pokerboy.

T
T
Murfreesboro, TN (Zone 7a) | August 2001 | neutral

Rock Roses (Cistaceae family) are sometimes classified as "woody perennials" and other times as "shrublets". They are not long-lived shr...Read More

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