Milka New England aster Symphyotrichum 'Milka') is hardy in the Chicago area and is grown for the lavender-purple flowers that cover the plant during autumn. It is insect- and disease-resistant when grown in full sun with open space between plants. First used in flower beds at the Chicago Botanic Garden in 2003, this was one of a wave of new aster hybrids promoted for growing as seasonal potted plants and cut flowers to compete with chrysanthemums. It has also proven hardy in gardens. It can reach a height of 3 feet, with double flowers. It blooms from late September to early November.