Answer: Tulips should be deadheaded to prevent the plant using energy on seed formation. To do this, remove the flower stems as soon as the blooms fade. The foliage must be left in place to grow, then allowed to fade and dry up naturally. This process rebuilds the bulb so it can bloom again. Some gardeners will plant tulips to the rear of the bed so that annuals and perennials can grow in front of them. This avoids the problem of disturbing the bulbs with other plantings and also hides the fading tulip foliage. If you are trying to plant on top of or in between the bulbs, you might use smaller annuals such as marigolds, ageratum, and so on.
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