I've had good established tiger Lillys for years around my LP gas tank. I proceeded to pull off the dead spikes since it's fall & the sticks came out by the roots. Did I kill them or will seeds still be in ground for next year? In the past I think my husband weed eated the dead stuff. Worried.
Tiger lilies are as close to indestructible as you'll find in a plant. Usually the old stems will come out easily if they are entirely tan/brown. The bit of root you pulled is just a fraction of what is underground. They will be fine.