How to Easily Root and Propagate a Cactus Step by Step Succulent Plant Care Why Do My Calathea Leaves Look Like This? The Houseplant Guru Did you know calatheas have corms?! Calatheas do produce storage structures often called corms, but technically they are rhizomes, which function similarly to corms for water nutrient storage and propagation, allowing the plant White spots on Calathea Makoyana in the Houseplants forum Garden.org