Dandelion and burdock roots, being perennial, are available all year, but it is important to collect them only when the leaves are visible so that you do not confuse them with anything nasty. Spring or autumn when the roots are at their fattest is the best time to search them out. Burdock has large, heart-shaped, furry leaves and a habit of providing us with those tiresome burs that accompany us home after a country walk.
