This cactus is part of the Cereus family, and is called a lemaireocereus pruinosus.

Care Tips:

 - Full sun.
 - Allow the soil to dry out completely in between watering. 
 - This cactus has a natural waxy, slightly white in colour coating. This protects the cactus and should not be wiped off.
 - Only repot from April-Jul.

12cm Pot.