When is the best time to separate Stella De Oro daylilies?
Early spring and fall are good times to separate and replant all types of daylilies, including Stella De Oro and other repeat-blooming varieties.
Daylilies (the botanical name is Hemerocallis) are blooming beautifully in gardens in Middle Tennessee. The ‘Stella De Oro’ variety, which is what you usually see growing in sweeping yellow masses around office buildings and in grocery store parking lots, seems to be the most common, but there are other wonderful repeat bloomers to consider. (By the way, you may see this variety spelled ‘Stella d’Oro’ elsewhere. I’m using the same spelling as the American Hemerocallis Society.) ‘Happy Returns’ is also yellow, but a softer, creamier shade than the brassy ‘Stella de Oro.’ ‘Rosy Returns’ has dramatic rose-pink flowers. There are several more.
The repeat bloomers are great because, unlike most other daylilies that bloom for a few weeks and are gone, repeaters will come back throughout the summer — though never as lovely as this first flush of blooms.
Experts at the National Arboretum say that most varieties can go for four or five years before they need to be divided. Others also note that repeat bloomers may tend to form bigger clumps, and may need to be divided more often.
When the time comes to divide them, use a garden fork to loosen the soil around the clump, and pry the clump of roots out of the ground. Divide it by pushing two garden forks back to back down into the center of the clump and push the handles apart to separate the roots.
To replant divisions, dig a wide, shallow hole and place the rootball into the hole. Backfill with soil and tamp it into place, then cover the soil with an inch of mulch. Water thoroughly. You can cut the foliage back to about 12 inches.