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Products > Helianthemum 'Wisley Primrose'
 
Helianthemum 'Wisley Primrose' - Wisley Primrose Sunrose
   

 
Habit and Cultural Information
Category: Perennial
Family: Cistaceae (Rock-roses)
Origin: Mediterranean (Europe)
Evergreen: Yes
Flower Color: Yellow
Bloomtime: Spring
Parentage: (Helianthemum nummularium hybrid)
Height: <1 foot
Width: 2-3 feet
Exposure: Full Sun
Irrigation (H2O Info): Low Water Needs
Winter Hardiness: 0-10 F
Helianthemum 'Wisley Primrose' (Wisley Primrose Sunrose) - Compact evergreen woody perennial or sub-shrub related to the larger Rockrose (Cistus) but growing to only 6 to 8 inches tall by up to 2 to 4 feet wide with gray foliage. In Southern California flowering commences in spring and lasts to early summer (April-June) with an off-bloom often in fall. The 1 inch wide yellow flowers open for a day and are closed by evening, yet they bloom in such a mass of flowers that the entire plant is masked behind them. This cultivar is noted for its gray foliage and bright yellow flowers with yellow stamens at the center. Plant in a location with good drainage in full sun to part shade with regular to infrequent summer irrigation. Hardy to 0 F. Shear after flowering to maintain tight growth habit and encourage rebloom. Great plant for an edging plant, a sunny border or even a small scale groundcover. The name for the genus comes from the Greek words 'helios', meaning "the sun" and 'anthemon' meaning "flower". The majority of cultivated Helianthemum plants are hybrids of H. apenninum and H. nummularium, the former from south and west Europe, the Mediterranean region and Asia Minor. The latter is native to Europe, Asia Minor, Armenia and the Caucasus and Atlas mountains. This plant received the prestigious Royal Horticultural Society's Award of Garden merit in 1993. We have been growing this cultivar since 1989.  This description is based on research and observations of this plant as it grows in our nursery, in our nursery garden and in other gardens that we visit. We also incorporate comments received and appreciate getting feedback of any kind from those who have any additional information about this plant, particularly if they disagree with what we have written or if they have additional cultural tips that would aid others in growing Helianthemum 'Wisley Primrose'.