Answer: Often the old bulbs have suffered a number of abuses: the foliage has been mowed or trimmed prematurely, they are competing with grass and other plants for nutrients, and they are overcrowded and need to be lifted and separated. Any improvements you can make in those regards will probably result in better bloom. Ideally you would lift and replant them into newly prepared and enriched soil, apply some fertilizer (complete such as 10-10-10 or with a higher middle number such as 5-10-5) next fall as the roots begin to regrow and again early next spring just as the tips begin to show through the soil. Also be sure to let the foliage fully ripen before removing it so that the bulbs can rebuild their strength as much as possible for next year's blooms. Good luck with your project, it is sure to be very rewarding!
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