Succulent lovers who are just starting out will be able to find many reasons why their succulents turn black. You can also make your own succulents if you want to have a bit more fun in your life. Euphorbia, like all succulents in the Euphorbia family, produces a milky white fuzzy stuff on succulents poisonous sap called Latex. It is made of tiny microorganisms, called diatoms. This article will discuss Euphorbia Inermis, which is a type of succulent.