How do you get rid of Tiger Lillies, the Orange kind that spreads?

You will have to dig up the bulbs or smother them out with heavy black plastic.

The only way I found to get rid of my daylillys, which also spread, was to dig them up. Lots of work, but they are gone!

A lot of people really like them. They're pretty, the buds are edible, and they are a no-maintenance house border.

Dig up and give away . . . Expensive plants where I live, or advertise "free lillies - dig your own for free!" And let the neighbors come dig them out for you. Problem solved, nothing killed.

Dig dig dig! It really works

Thank you for your suggestions. I tried the heavy Black plastic, and stapled it down with Garden Staples. These persistent shoots pushed the Plastic and it looked like a Balloon. I made the mistake of having the area Roto tilled, and hand picked the tubers and roots . The smallest piece of root that was left, showed up .

I will do as suggested DIG, Dig.