Aquarium plants require certain essential nutrients for vibrant growth. Root Tabs are formulated to supply key nutrients, including iron and potassium, to help new aquatic plants get off a vigorous start and to keep established plants flourishing. Add 1 tablet for each square inches of gravel surface.
At one end of my aquarium plants wouldn't grow, didn't layout the proper substrate. Stuck API Root Tab under the gravel and set a lant, woe-and-behold the plant is thriving, I love it!