Melocactus azureus v. ferreophilus Cactus the clump itself stays pretty

the clump itself stays pretty small

Allauaudia procera A wonderfully strange plant from the arid regions of Madagascar

The caudex is brown and mostly smooth when young but in time becomes cracked and fissured

Color is also better in cooler weather (that's normal for most Aloe hybrids)

Produces big yellow flowers in summer

Melocactus azureus v. ferreophilus Cactus the clump itself stays prettyMelocactus azureus var. ferreophilus This is a nice cephallium forming species with green to blue green skin. It looks and grows like normal cactus several years but once it gets big enough the main plant stops growing but produces a large hairy inflorescence that continues to grow for the rest of the life of the plant. Eventually the inflorescence can be taller than the plant itself. This is more tropical than most succulents so it doesn't like cold