Leuchtenbergia principis:

Leuchtenbergia principis is the sole species of the genus Leuchtenbergia, it is a unique looking cactus with very long tubercles, making the plant resemble an agave. It is slow-growing but can eventually grow up to 70 cm high.

This plant is already forming a caudex. One of the few cacti that will form a caudex.

Specimen is growing in a 4 in plastic pot 

U.S. SHIPPING ONLY
Plants ship bare root, pot/soil not included