I've got several large patches of orange day lilies in the back yard and on the side of the house. They've all come from the original small clump I planted when we moved into this house 24 years ago. The clump kept expanding, so every couple of years I'd dig up a piece and move it somewhere else.
impossible to kill. A couple of weeks ago I noticed some green lily leaves growing among the rocks under the deck. The rocks are piled several inches deep, and there's a weed barrier under the rocks. Somehow, though, the lilies found a way.
As much as I admired their fortitude, the sprouts had to go. One day when the ground was nice and soft after a rainfall I moved the rocks from around each sprout, then used a garden trowel to dig down and remove the small invaders. Most of them came out easily, but two broke off just beneath ground level, leaving their tuberous roots behind.
As I was finishing the job it started sprinkling again. I know I should have continued to dig deeper and completely remove the complete roots, but I didn't feel like getting wet. Instead just I tamped the soil back down and piled the rocks back on top.
Any bets on how long it will take until I have to repeat the job again?