Cactus Gymnocalycium mihanovichii f. variegata is quite a mouthful but it’s more easily remembered by its nickname of ‘Moon Cactus’  - a name it deserves due to its extraordinary, glowing colours. A native of desert habitats in Argentina, it lacks green chlorophyll, forming a luminous globe of orange, pink and yellow. The cactus is actually two cacti combined - it is grafted onto the thick base of another, chlorophyll-producing cactus, which provides it with the sustenance it needs to grow. These cacti remain small, reaching a maximum of 2 inches across. Height and spread: 5cm (2in).