A must in any butterfly garden, asters come in a variety of colors and are drought-tolerant. Pictured here is a blue-violet variety of the perennial. they bloom in the late summer to early fall and require full sun. Height ranges from 18 to 24 inches. Zones 4-9Clouded Sulphur (Colias philodice)
These make flights from spring to fall, appearing throughout the United States, except California, southern Texas, and Florida. The first spring arrivals bear less of the characteristic marks than fall forms. Look for semi-transparent, yellow-orange wings with dark spots near the top of each one. Clouded Sulphurs will also feature a lighter-colored, slightly larger spot on hindwings. Some females feature white wings and similar markings.