Cistus is the name of a group of shrubs commonly called Rock Roses. The common name refers to the similarity of their flowers to wild roses and the preferred habitat of the plants: rocky and relatively poor soil. In dry, sunny locations most Rock Roses will thrive on neglect, making them a great choice for a sustainable garden as they require little to no supplemental water and requires no soil amendments or fertilizer. The botanical name "Cistus" is taken from the greek word "Kistos"; these are mediterranean plants that have been in cultivation since the times of antiquity.
Despite their origin, Rock Roses are adaptable and can be used in many temperate climates too, as they are commonly found in home gardens of the Pacific NorthWest region of North America or in the British Isles. As more and more homeowners remove their thristy lawns, they are increasingly popular in California. Colwynn Design has designed a number of gardens in Southern California that include Cistus, here are some species we like:
Orchid Rock Rose (Cistus x purpureus)
This is a classic mediterranean garden shrub, that has been used by garden designers since the 1700s. Plant in full sun and requires little to no irrigation - this is a truly tough as nails drought tolerant plant that stays green year round and can tolerate a lot of heat. A lot of drought tolerant plants have oily leaves like this one and as it gets hotter, the plant becomes more and more fragrant.
Cistus 'Mickie' (Cistus x. hybridus 'Mickie")
This cistus has small white flowers and stunning variegated leaves. It grows as a low mounding groundcover and is very adaptable to dry hot conditions as well as cold wet winters. Nothing fazes this plant except lack of sun. Note, this is a slow grower, its worth paying the extra for a large pot of this plant, despite the expense. An almost identical variety called "Little Miss sunshine" is also available.
Gum Rockrose (Cistus ladanifer)
The biggest flowers of any Cistus species, they are often 3-4 inches (5-8cm) wide. The common name refers to the gummy leaves that are sticky with a very fragrant resin. This resin is called labdanum and is is the main ingredient used in making the scent of amber in perfumery. Labdanum's odour is variously described as amber, animalic, sweet, fruity, woody, ambergris, dry musk, or leathery. Has a more upright shape than most Cistus.
Pink Rockrose (Cistus x skanbergii)
This is a hybrid of Cistus monspeliensis and Cistus parviflorus. Unlike other popular hybrid garden plants, this one is a naturally occuring hybrid so it is considered native to the overlapping boundaries of the natural ranges of these two species in Greece and Sicily. This is an important distinction because human engineered hybrid plants have a tendency to be less robust than natural hybrids.