Melocactus caesius

Melocactus caesiusMelocactus caesius Flowers: dark purple to light pink Blooming season: spring to summer, the flowers open late in the afternoon. Cultivation and propagation: It grows from April to October, it cant endure long stretches of total dryness, and also too much water will rot it, as its weak root systems tends to be inefficient at sucking up water from wet soil. Nonetheless, again as a result of their tropical origins, they need a fair amount of water, but

Melocactus caesius

Flowers: dark purple to light pink
Blooming season: spring to summer, the flowers open late in the afternoon.
Cultivation and propagation: It grows from April to October, it can’t endure long stretches of total dryness, and also too much water will rot it, as its weak root systems tends to be inefficient at sucking up water from wet soil. Nonetheless, again as a result of their tropical origins, they need a fair amount of water, but allow the soil to dry quite a bit before watering again.
Melocactus caesius rests from October to April but can’t stand cold, or even fairly cool temperatures, so it is indispensable to keep it above 8-12°C at all times. The root system is weak and generally resents being repotted and can take a long time to re-establish. The soil mix should be very quick draining, prefers very bright light.

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz