Daylilies are beautiful flowers, but prolific spreaders. You'll often see roadside ditches filled with these summer blooms, which grow from corms, a type of bulb, and multiply and spread every year. If you've got daylilies spreading where you don't want them, removing them requires just a good shovel, some muscle and some time.
Dig a trench around the area where the daylilies are growing. Use a shovel or spade. You don't have to make the trench deep, just about 6 inches.
Cut the daylily foliage down with a pair of sharp pruning shears or clippers. Leave about 1 inch of foliage above the ground.
Spread a large tarp out on the ground beside the area where you're working.
Stand outside the trench and start digging inward and downward, scooping down and lifting out clumps of dirt and daylily corms. Dig down at least 12 inches, because, according to the folks at Dayton's Nurseries, daylilies often form root systems that deep. Lay the dirt and daylilies down on the tarp as you lift them out.
Continue digging and removing corms until you've dug up the entire area.
Go over the area with a rake and remove any more corms you find.
Sort through the pile on the tarp; remove the daylily corms, then replace the dirt in the area or use elsewhere in your garden.
Store the daylilies in a cool, dark place or plant them (in fall) in another area, or give them away to gardening friends.