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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.  The information on this page is based on the research that we have conducted about this plant in the San Marcos Growers library, from what we have found on reliable online sources, as well as from observations made of our crops of this plant growing in the nursery and of plants growing in the nursery's garden and those in other gardens where we may have observed it. We also have incorporated comments received from others and welcome getting feedback from those who may have additional information, particularly if this information includes cultural information that would aid others in growing Helianthemum 'Wisley Primrose'.