Referring to a cannabis plant\’s circulatory system which carries sap throughout the body of the plant.
Merriam-Webster Online Dictionary
vascular (adjective)1.
of or relating to a channel for the conveyance of a body fluid (as blood of an animal or sap of a plant) or to a system of such channels , also supplied with or made up of such channels and especially blood vessels - a vascular tumor a vascular system
2.
marked by vigor and ardor - passionate
circulatory, veinous, vessel-related, blood-flow, transport-system