Answer: Daffodil bulbs are very longlived, but most varieties do need to be divided and replanted when they become crowded. Failure to do this can result in foliage without blooms. Another cause for foliage without blooms is removing the foliage while it is still green instead of allowing it to grow, replenish the bulbs, and then die back naturally. In your case, I suspect they need to be lifted and divided. You can do it in the fall, or you can do it when the foliage is faded. If you dig them then, you will need to store them for the summer. If you plant to do it in the fall, mark the spots where they are growing so you can find them easily.
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