Rosularia is a genus of succulent plants in the Crassulaceae family. The species are native to Europe and northern Africa.
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Rosularia & Prometheum
Mat Forming with Dense Clusters, Part or Filtered Sun
Rosularia (ros-uh-LAIR-ee-uh) & Prometheum(pro-MEE-thee-uhm) are mat-forming, cold hardy succulents that are difficult to find in most collections. They have the classic rosette shape and low maintenance needs of Sempervivum (Hens & Chicks) but are unique in their ability to bloom repeatedly. Like their close relatives Sedum (Stonecrop), Rosularia & Prometheum make a colorful and easy to grow ground cover, even with poor soil and infrequent watering.
- Form:Rosularia &Prometheum rosettes stay under 4” tall and spread as a dense mat by sending out new offsets on stolons.
- Foliage: Their fleshy leaves are a soft green lined with dusty rose, yellow, or purple. These colors flush brightest with some sun and heat stress.
- Flowers: In late spring and summer, bloom stalks erupt from the mat of rosettes, unfurling tiny yellow and white star-shaped flowers.
- Light:Rosularia & Prometheum grow best outdoors in full to partial sun. Indoor growing is more challenging, but possible if plants are kept near a very sunny window or under a dedicated grow light.
- Soil: Whether in the ground or a container, Rosularia & Prometheum need a well-draining, sandy soil like cactus/succulent potting mix. If you choose to fertilize, use a slow-release, low Nitrogen (5-10-10) fertilizer and apply it in the spring.
- Water:Rosularia & Prometheum have low-water needs and will rot if over-watered. Water deeply but infrequently, giving enough time for the soil to dry completely. In winter, the shorter, colder days signal them to slow their growth, during which time they need even less water. If planting in a container, it’s best to use one with a drainage hole ( more info ).
- Hardiness: Most species of Rosularia & Prometheum are cold hardy down to -20F (zone 5) and will survive deep winter freezes protected under a blanket of snow ( more info ).
- Propagation: You can cut the offsets from their stolons to transplant. Rosularia & Prometheum can also be regrown from leaf cuttings or left alone entirely to self-propagate.
NOTES FROM THE NURSERY
Rosularia & Prometheum are excellent choices for rock gardens, ground cover, miniature/fairy gardens, and indoor or outdoor containers. Try tucking them into the crevices of a stone retaining wall and prepare to be amazed.
The most common challenge for Rosularia & Prometheum is over-watering. Always err on the side of less frequent watering and provide great drainage. If planting in containers, use pots with drainage holes and a gritty, well-draining soil.
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What is Rosularia?
Turkish stonecrop, aka Rosularia, is a rosette forming succulent that looks similar to Sempervivum or Echeveria but is actually related to Kalanchoe and jade plant. Native to Turkey and areas of the Himalayan Mountains, most Rosularia varieties are hardy down to zone 5, with a couple varieties hardy to zone 4.
Alhough Rosularia is not actually a Sempervivum, they are usually listed with them because the two plants have a very similar appearance. Rosularia grows in small rosettes with flat green succulent foliage, much like hens and chicks. Depending on variety, Rosularia foliage often has red, purple or yellow margins that may be covered in tiny hairs, called cilia. When present, these small hairs help plants capture water and nutrients and transport them to the root zone.
What obviously sets Rosularia apart from Sempervivum are the flowers, which bloom in midsummer. While flowers of Sempervivum and many other related succulents are star shaped, Rosularia flowers are small, tube or funnel shaped atop tall stems that grow up from the center of the rosette. These blooms can be white, yellow, pink or purple and may even be variegated, depending on variety.
After Sempervivum blooms, its rosette dies. After Rosularia blooms, its rosette continues to live and can produce more flowers. To deadhead spent blooms, simply cut the flower stems back to the rosette.
Rosularia was originally described by De Candolle (1828) as a section of the genus Umbilicus,  and raised to the level of genus by Stapf (1923)  Thus the genus bears the botanical authority (DC) Stapf of both authors. 
In 1930 Berger included it in family Crassulaceae subfamily Sedoideae, as one of 9 genera.   He further divided it into two sections (Eu-Rosularia and Ornithogalopsis) and further series,  transferring some species of Sedum to it. Since then a number of species have been transferred in and out of the genus, including S. sempervivoides, which at one stage was placed in Prometheum.  The genus Sempervivella was submerged in Rosularia.  The genus is now placed within the Leucosedum clade, tribe Sedeae, subfamily Sempervivoideae of the Crassulaceae, but is embedded within Sedum paraphyletically.   
Rosularia contains about 28 species. The following species and subspecies were accepted by The Plant List (2013):  
- Rosularia adenotricha(Wall. ex Edgew.) C.-A. Jansson
- Rosularia adenotricha subsp. viguieri(Raym.-Hamet) C.-A. Jansson
- Rosularia aizoon(Fenzl) A. Berger
- Rosularia alpestris(Kar. & Kir.) Boriss
- Rosularia alpestris subsp. marnieri(Raymond-Hamet ex H. Ohba) Eggli
- Rosularia blepharophyllaEggli
- Rosularia borissovaeU.P.Pratov
- Rosularia chrysantha(Boiss. & Heldr. ex Boiss.) Takhtajan
- Rosularia cypria(Holmboe) Meikle
- Rosularia davisiiMuirhead
- Rosularia elymaitica(Boiss. & Hausskn. ex Boiss.) A. Berger
- Rosularia glabra(Regel & Winkl.) A.Berger
- Rosularia globulariifolia(Fenzl) A. Berger
- Rosularia haussknechtii(Boiss. & Reut. ex Boiss.) A. Berger
- Rosularia jaccardiana(Maire & Wilczek) H. Ohba
- Rosularia libanotica(L.) Sam.
- Rosularia lineata(Boiss.) A.Berger
- Rosularia luteaBoriss.
- Rosularia pallida(Schott & Kotschy) Stapf
- Rosularia pallidiflora(Holmboe) Meikle
- Rosularia persica(Boiss.) A. Berger
- Rosularia pilosa(Fischer ex M. Bieberstein) Boriss.
- Rosularia platyphylla(Schrenk) A.Berger
- Rosularia radicosa(Boiss. & Hohen.) Eggli
- Rosularia rechingeriC.-A. Jansson
- Rosularia rosulata(Edgew.) H. Ohba
- Rosularia schischkiniiBoriss.
- Rosularia sedoides(Decne.) H. Ohba
- Rosularia semiensis(J. Gay ex A. Richard) H. Ohba
- Rosularia sempervivoides(Fischer ex M. Bieberstein) Boriss.
- Rosularia serpentinica(Werderm.) Muirhead
- Rosularia serrata(L.) A.Berger
- Rosularia subspicata(Freyn) Boriss.
Rosularia is found in arid and semi-arid regions from N. Africa (Morocco, Ethiopia), through the eastern Mediterranean to Central Asia (north of Tien Shan and east of W Himalaya), including Pakistan.  
Rosularia is an important larval host for the Central Asian butterfly Parnassius apollonius. 
A number of species are cultivated as ornamental garden plants, and have been used in traditional medicine. 
- ^ abcWFO 2019.
- ^de Candolle 1828.
- ^Stapf 1923.
- ^Berger 1930.
- ^ abcdSarwar & Qaiser 2012.
- ^ abcOhba 1978.
- ^Mayuzumi & Ohba 2004.
- ^Thiede & Eggli 2007.
- ^TPL 2013.
- ^Tropicos 2019.
- ^RHS 2019.
- ^Tuzov 1997.
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