Miracle-Gro Shake 'n Feed® Tomato, Fruit & Vegetable Plant Food contains vital micronutrients, plus added natural ingredients, to nourish above and below the soil. It contains kelp, earthworm castings, feather meal and bone meal in an all-in-one particle. Added calcium helps form stronger cell walls, producing better quality and longer-lasting fruits and vegetables versus unfed plants. Plus, it helps prevent disorders in edible crops commonly associated with calcium deficiency. You can use it anywhere: in-ground and in containers with continuous feeding for up to 3 months.