Growing rare caudex plants: a guide to the girthiest of plants

With the mass popularisation of Stephania erecta, caudex plants are finally enjoying their moment in the sun. But if you're into these fattest of fat plants, what are some similarly impressive species? And how do you best look after them -- not only to keep them happy and healthy, but encourage the girthiest of growth? That's precisely what I tackle in this beast of a video