Q: Is it better to separate Stella d Oro daylilies in spring or fall?
A: In my experience, you can divide daylilies successfully every day of the year…but the best time is in spring, before they bloom. Repeat-blooming daylilies like yours get crowded quickly. Scoop up a clump, wash off most of the soil, and use a sharp knife to separate the individual plants. Mark your calendar to divide the clump every three years. You’ll get better blooms if you fertilize them a couple of times each year as well.