Green vein kratom is the category of kratom that all green strains belong to. Each strain is harvested from majority green vein leaves, meaning the leaves that were harvested for the batch have a green stem and vein appearance. The veins itself don’t influence the color of the powder for any given strain as the color of all leaves are green. The drying process and maturity of the leaves harvested can impact the color of the powder. Green strains are known as the-strain-in-between white and red strains.