Answer: Daylilies can be divided almost anytime up until early fall. (They need to be able to root before winter sets in.) However, the best time is late summer after they bloom. Doing it earlier in the year may sacrifice the current year's bloom, although in my experience early spring has worked very well. Be sure to water them well the day before, prepare the new planting area ahead of time, then dig, divide and replant promptly. Larger divisions seem to work better if the job is done in the spring. Mulch them and be sure to water them in well and water regularly until they are reestablished.
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