Where it grows
Mammillaria elongata is native to Mexico in its natural form, though the crested ‘brains cactus’ cultivar is only grown in horticulture.
Special features
Mammillaria elongata f. cristata, otherwise known as the ‘brains cactus’. Brains cacti form compact ridges of contorted, overlapping stems which give these plants the appearance of a human brain. They are yellow-brown in colour and are covered in small yellow-white thorns. This form does not produce flowers on the crested growth, but may form white or pink flowers on any growth that has reverted to normal.
Care guide
The brains cactus can be grown in full sun for better colouration, or given a bit of light shade for faster growth. Water well in spring and summer and keep dry in winter and autumn. Do not let water sit between the grooves of the stems or it will cause rotting. Plant them in a good airy mix with as little organic material as possible to encourage drainage.
Growing season
Spring and summer.
Propagation
Cuttings.