|When and how often do day lilies need to be thinned? We have some that are 5 plus years old and they are more bushy and less flowers per plant. Each year they are bigger but less blooms.|
There is not a magic number of years, although every 4-5 years is a fair ball park number. It really comes down to when the clumps are crowded and less productive. The following web site provides excellent information on growing and dividing daylilies:
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