Michaelmas daisy Symphyotrichum

Symphyotrichum is a genus of over 100 species of flowering herbaceous perennials and annuals in the aster family. Most species are native to North America, but some are found across South America and Asia. The species were originally grouped under the Aster genus, but have since been separated into their own genus. The genus name is compounded from the Greek symph-, which means "coming together," and -trichum, which means "hair" in possible reference to the flower anthers. The common name michaelmas daisy refers to the feast of St. Michael, which falls on September 29 when many Symphyotrichum species are in bloom.

The Symphyotrichum genus is composed of plants that range from 2 to 5 feet high, sometimes clumping to an equal width, and slightly hairy foliage. They are most noted for their colorful, daisy-like flowers that bloom from summer into late fall.

Symphyotrichum do best in full sun, which promotes flowering and plant growth, but will tolerate some light shade. Site the plants in well-drained, moderately fertile soil, although the plants will do well in a variety of soil types from clay to sandy loam. 

Diseases, Insect Pests, and Other Plant Problems:

No serious insect or disease problems. Some susceptibility to powdery mildew and rust.