Flowers: Red, purple, scarlet, pink or salmon-orange.
Blooming season: It blooms in spring, flowers remain fully open most of the day and night. They usually expand in the afternoon, or towards evening. The flowers can last for a week or more and remain open at night, closing somewhat during the hottest part of the day.
Growth rate: It is a relatively rapidly growing species that will make clumps given the best conditions.
Watering: It is sensitive to over-watering (rot prone) and needs good drainage. Keep drier and cool in winter. In the summer it needs an airy location in bright sun; keep it well watered when it's hot.
Hardiness: In the winter light, cool, and absolutely dry conditions. Reputedly resistant to frost if kept on the dry side prior to, and during, cold weather.
Exposition: The plant tolerates bright situations which encourages flowering, but is likely to suffer from sun scorch or stunted growth if over exposed to direct sunlight during the hottest part of the day in summer. It may tolerate filtered sunlight or afternoon shade.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz
