Treasure New England aster (Symphyotrichum novae-angliae 'Treasure') is a hardy addition to any midwestern garden. Large, purple flowers cover this large perennial from early August to early October. Typically growing from 3 to 6 feet, this butterfly attractor tolerates clay soil and naturalizes well. Pinching back the stems in early summer can help control plant height in the garden¡ªthose 6-foot-tall plants can topple, and will need staking once blooming begins in fall.

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