Melocactus azureus v. ferreophilus Caudiciform Large mature specimens can be

Large mature specimens can be 10' tall and nearly as wide

It is a something of a winter grower so give it more moisture in the cooler months and hold back on the water in the summer

cylindrica

I expect next year they will be somewhat larger but still have the same leaf shape

if not the smallest species of Aloe

Melocactus azureus v. ferreophilus Caudiciform Large mature specimens can beMelocactus 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