These beautiful flowers come up behind my house every spring in a little patch that was probably was once a garden— the air-conditioning units were placed there some years ago, before we bought the house. Sometimes, in cleaning out that little space in the spring, I forget these and mow down the first sprouts with the weeds that are peeking through.

These purple flowers look like a type of lily. That’s my best guess. They hang pretty heavily on amid long blade-like foliage. Does anyone know what these are?