when and how should I feed my daffodils?
Howard County Maryland
Spring-flowering bulbs such as daffodils can be fertilized after the flowers have faded but before the foliage dies back. Our soils are not often deficient in major plant nutrients, but if they have declined in vigor over the years or have recently been divided and replanted, fertilizer may have some benefit. The "Maintenance of Bulbs" section on this page mentions what types of fertilizer to look for: https://extension.umd.edu/hgic/topics/bulbs.