This clustering cactus forms branches up to 75mm (3in) thick. It is covered in conical tubercles that have wool in the axils and are tipped with whitish needle-like spines. The whitish funnel-shaped flowers appear during daylight in summer.

Hardiness zones 10 to 11 

Mammillaria nejapensis is naturally found in North America growing in New Mexico in gravelly well drained soils in an open sunny position and tolerates drought or high temperatures but is frost tender. 

The Royal Cross is grown for its woolly appearance and its flowers. It is planted in rockeries or cactus and succulent gardens as a specimen and suitable for coastal or inland regions. It can also be grown against a sunny wall establishing from division in 2 to 3 years and is used as an Indoor plant. ID 2092

Mammillaria (măm-i-LAH-ree-a) nejapensis (nee-jap-EN-sis)

Cactaceae (kak-TAY-see-ee)