Day lilies--scientific name Hemerocallis--are perennial plants that grow in any soil type and enjoy direct sunlight without being harmed. They are so easy to grow that they are hardy in USDA zones 1 through 11. According to the Houston Chronicle, day lilies need to be propagated once every three to four years. You can divide your day lilies to add more flowers to your flower garden, or give them to a friend or neighbor.
Wait until the fall to propagate your day lilies.
Put on your gloves and use a pair of garden scissors to cut your day lilies back to 6 inches from the ground. This makes handling them easier.
Dig up your day lilies with a shovel. Make sure you get the entire root ball. This is easy because the root ball forms one big clump.
Hose down your root ball to remove loose dirt so you can clearly see the divisions.
Pull the divisions in the day lily apart by hand utilizing a twist-and-pull motion. If the day lily does not pull apart easily, use a screwdriver or a knife.
Replant your day lilies, and their divisions. Do this in any soil, but add some organic compost first. Water the day lilies immediately after replanting.