The Cabbage White is perhaps our most familiar butterfly after the Monarch. What is not generally known, however, is this medium-sized ubiquitous butterfly is an invasive species, accidentally introduced onto North America at Quebec in 1860. There is no other butterfly that is so successful over such a large variety of landscapes and climates. Here in the Midwest, this butterfly is everywhere, usually in large numbers. Farmers and gardeners consider the Cabbage White a pest species; its caterpillars have a ravenous appetite for radishes, cabbage, and nasturtiums.