not if you grow outside, last spring i buried a few seeds, left, cam eback a month and a half later and had a pretty big plant. if your in a place thats warm in the summer and gets enough rainfall, all you will need are seeds. haha, i need to get some seeds too before spring or else i wont be able to plant this year. . last year i just got lucky and found some seeds in a dime bag. just keep your eyes out. peace.