This is a classic case of gardening gone awry. Siberian Squill was brought to this country as an ornamental and is still sold in Minnesota and elsewhere, but it has also escaped into the wild and become invasive. It readily spreads itself and is difficult to get rid of, as broken roots often resprout. It is very hardy and cold tolerant, and is left untouched by critters from voles to deer. Sadly, the same traits that make it attractive as a garden plant (besides the vivid color) are also what make it invasive.