Down To Earth 6-Pound Acid Mix 4-3-6 7803 To encourage lush flowers and fruit, use our acid mix in early spring for vegetative growth and again when blooms appear Apply 5 lbs per 100 square feet. 6 lb box Additional application rates included on package Derived from: Cottonseed Meal, Fish Bone Meal, Langbeinite, Rock Phosphate and Kelp Meal ALSO CONTAINS NON-PLANT FOOD INGREDIENT(S): 2.5% Humic Acids derived from Leonardite.