(This plant comes in a 3.5 inch pot. You will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase. The plant is shipped in its pot to prevent any damage to the roots).
(Synonym: Echinopsis or Lobivia backebergii)
Description: Echinopsis backebergii is a small cactus species, with conspicuous bright colored blooms.
Flowers: Large, diurnal, borne laterally near the stem tips, funnel shaped, very colorful pale to dark carmine-red or violet, often with a bluish sheen and white throats, 4-9 cm long, 7,5-9 cm in diameter. Tube relatively slender 4-7 mm in diameter. Tepals lanceolate.
Cultivation and Propagation: Echinopsis backebergii grows rather slowly and it is sensitive to overwatering (rot prone) and needs a very good drainage to avoid rotting but requires more moisture than true desert cacti to grow and produce flower. It is a very easy flowerer, if you keep it reasonably cool and absolutely dry during winter and lots of fresh air and sunshine tends to produce better plants and more flowers.
Soil: Use a loose well drained cactus mix.
Sun Exposure: Light shade when young, full sun later. Outside it likes strong sunshine but is tolerant and do well with light shade during the hot Summer months.
Hardiness: It is cold resistant to -10° (or even less depending on clones) for short periods of time. It will show its flowers only if we provide an adequate winter rest period.
Watering: Water regularly through the growing season. This can be done weekly or more frequently during the summertime, if the weather is sunny enough, but allow to dry fully before watering again. Kept this way, plants will show a healthy growth. Keep rather dry as soon as the temperature starts dropping in October and keep it dry in winter. The plant survives outside without protection in winter but is then somewhat prone to rot, too.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz