Daylilies are showy perennials available in many different varieties and colors. They are incredibly resilient and are capable of thriving in almost any environment. The flowers only last for one day, but each plant produces such an abundance that the brief life of the bloom is hardly noticeable. While daylilies are hardy in USDA zones 3 through 9, you should provide the plants with added winter protection in regions that experience harsh winters.
Water the daylilies whenever the soil feels dry, up until the first hard freeze of the season. This will help ensure that the root system is healthy enough to withstand winter.
Cut the foliage back to within 5 to 6 inches of the ground. You can do this any time after the leaves have begun to dry and turn brown.
Add a 3-inch layer of organic mulch around the daylilies. Check the plants throughout the winter to make sure that the covering hasn't been disturbed. Replace the mulch as necessary.
Remove the mulch in spring, after all danger of frost has passed.