Discocactus araneispinus Mesemb It only grows a few

It only grows a few inches tall but spreads horizontally forming a clump a foot or more across in time

Mammillaria plumosa  A very attractive clumping Mammillaria

Titanopsis calcarea    An attractive little clumping Mesemb with warty blue-green leaves

Easy to grow but can be sensitive to overwatering

The rosettes usually stay 8" diameter or less

Discocactus araneispinus Mesemb It only grows a fewDiscocactus araneispinus An interesting small cactus that produces attractive white spines and a white fuzzy cephalium (head or cap) when mature. When young it grows like a regular green cactus, but once the cephalium starts growing (as this plant is just starting to do) it stops growing its green stem and only produces the head for the rest of its life. As time goes on this cephalium gets wider and fluffier and regularly produces white flowers out of