Answer: Daffodils and tulips do best if given some phosphorus in the fall when they begin rooting, and then some complete fertilizer in the spring just as they poke through the soil. To maintain bloom production, the bulbs need to grow and ripen their foliage every year, and they need to lifted and divided when they become crowded. It is also true that some varieties tend to be more long lived than others, and some may deteriorate over time no matter what you do. This is particularly true of many tulips.
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