Formulated to aid in the development of strong root systems, sturdy stems, and colorful flowers, Bulb Food is used at planting time and during the growing season. Bulb Food provides ample quantities of nitrogen, phosphoric acid, and potash for good growth and bulb development for next year’s bloom. It contains 10% organic bone meal, ammonic and organic nitrogen, 9% calcium, 1.5% magnesium, 2% sulfur, 3% iron, 0.2% manganese, and 0.2% zinc.