If you want your bulbs and roses to have vigorous roots and profuse blooms, you need to feed them phosphorous and calcium. Whitney Farms 6-9-0 porcine bone meal is a natural source for these essential ingredients. Great for tulips, daffodils, calla-lillies, hyacinths, and other spring bulbs, as well as all types of roses. Use to correct phosphorous deficiencies the the soil. Bone meal also provides a natural non-manure source of 6% nitrogen. Apply once in the spring.