Answer: There are a number of reasons for this to happen. Over time most tulips divide into smaller non-blooming size bulbs or simply degenerate so many gardeners will replant with fresh new bulbs every year or every other year. Another approach is to dig them and replant the smaller bulbs in a nursery bed where they can rebuild their size and strength for a year or so, then replant them in the display area. They may also fail to rebloom if the foliage has not been allowed to grow and ripen sufficiently before removal, thus preventing the bulbs from rebuilding their strength. If newly planted tulips do not bloom, it may be because they were too small or of poor quality or were planted very late in the fall. It may also be because they are not in a sunny location or are in very heavy or poorly drained (meaning soggy) soil. Finally, there may be a disease or insect at work. I hope this helps you figure out what is wrong with your tulips.
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