Exclusive. We have developed our own Daffodil Fertilizer, a slow-release 5-10-20 formula with trace elements, that gives the Daffodils a continual supply of nutrients while they are growing, from the time they initiate root growth in fall until the foliage matures in June. Daffodils and other members of the Amaryllis family (including Galanthus, Snowdrops) like the extra potassium. It's easy to scatter the granules on top of the ground in fall after planting your bulbs or to apply a light dressing (1/4 cup per 10 sq ft) as new growth begins to push through the soil in spring. A 10lb. bag covers about 200 sq. ft.