Butterfly weed, like other milkweeds, is a nectar source for many butterfly species. This is where it gets its common name. It is also a caterpillar and larva host for the monarch butterfly, which may blend in with the abundant clusters of vibrant orange flowers that cover the tops of these perennial plants in summer. This is a medium sized plant, 12-24 inches. This plant needs sun daily, about 6 hours of direct sunlight daily.