It endures probably because it's poisonous and the deer don't eat it.
The blasted deer eat everything.
Including every last one of the leaves on my brand new plum tree. Which really ticked me off. And which I took as a personal affront.
If I ever
They make gorgeous shade garden plants. And they're pretty easy, unless you accidentally weed them out, which has never, ever happened to me. It's just that the Jack in the pulpits in my garden mysteriously disappeared that one day after I was weeding.
It was a coincidence, I'm sure.