Tulsi is an upright bushy shrub that grows up to 18 inches. It's hairy stems sprout oval leaves with serrated edges, and depending on the variety, range in color from light green to dark purple. The tulsi plant blooms erect purple or reddish flowers and produces tiny rust-colored fruit. Medical Use of Tulsi: Tulsi can help cure fever. Tulsi leaves are used to treat skin problems like acne, blackheads and premature ageing. Tulsi is used to treat insect bites. Tulsi is also used to treat heart disease and fever. Tulsi is also used to treat respiratory problems.