|Toxicity and edibility:||Some species are toxic|
Sedum, commonly known as rockcress, is a genus in the family Crassulaceae, members of which are broadly referred to as stonecrops. The genus consists of about 400 species of leafy succulents, found primarily, but not exclusively, throughout the northern hemisphere, varying from annual groundcovers to shrubs.
The plants have water-storing leaves and a typical form of blossom with five petals, seldom four or six. There are typically twice as many stamens as petals.
Well drained soils. Many sedums are extensively cultivated as garden plants, due to their interesting and attractive appearance and hardiness. The various species differ in their requirements; some are cold-hardy but do not tolerate heat, some require heat but do not tolerate cold. They are preferred over grass for green roofs, popular in Germany and some other countries.
Sedum reflexum, known as "stone orpine" or "crooked yellow stonecrop", is occasionally used as a salad leaf or herb in Europe (and the United Kingdom) . It has a slightly astringent sour taste
Sedum acre ("biting stonecrop") on the other hand contains high quantities of piperidine alkaloids (namely (+)-sedridine, (-)-sedamine, sedinone and isopelletierine) which give it a sharp, peppery and acrid taste and make it somewhat toxic. Depending on the amount consumed, irritations of the mucous membranes, cramps and paralysis, including respiratory paralysis may ensue. In ancient Greece, biting stonecrop was used to treat epilepsy and skin diseases, as well as to cause abortions.
Pests and diseases
- Septoria sedi
- Greedy Scale: Hemiberlesia rapax
- Black Vine Weevil: Otiorhynchus sulcatus
- Variegated Fritilary: Euptoieta claudia
Hylotelephium telephium ssp. maximum, formerly placed in Sedum
- Britton, Nathaniel Lord; Addison Brown (1913). An Illustrated Flora of the Northern United States and Canada, Volume 2 (second edition ed.). Dover Publications, inc.. pp. 207-210.
- Ann Fowler Rhoads and Timothy A. Block (2000). The Plants of Pennsylvania: An Illustrated Manual. Anna Anisko, illustrator. Morris Arboretum, University of Pennsylvania Press. pp. 366-368.
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- Cranshaw, Whitney (2004). Garden Insects of North America: The Ultimate Guide to Backyard Bugs. Princeton University Press. pp. 620.