Answer: Tulips need to be planted in full sun and good soil in order to perform their best. They also appreciate a bit of complete fertilizer early in the spring as they emerge froem the soil, again when they bloom and again in the fall when they are rooting. The foliage must be allowed to grow and mature and ripen each spring in order to replenish the bulbs. Deadheading, or removing the spent flowers, being careful to take the base of the flower in addition to the petals, can also help keep the bulbs stronger. The bulbs may need to be lifted and divided every few years when they become crowded and should be planted at the deeper end of the range of suggested depths. And last of all, some varieties simply perform and last better over time in the garden while others seem to fade away.
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