They don't. Kratom isn't like cannabis - it's one tree, *Mitragyna speciosa*, and the colours are the tree at various stages of maturity (from white to green to red; the colour is the colour of the leaf veins). Cannabis, on the other hand, has been continuously hybridised, so there are literally 100s of different strains (or varieties). With Kratom, the leaves at various stages of maturity contain different levels of alkaloids. You just don't understand about Kratom - the only obvious thin