I first grew this plant in Garden #1 in the East Village. It was extremely long-blooming, blooming for months in the partial shade of the widlflower garden there. It forms a large clump over time. The ferny foliage is very effective and interesting when the plant is not in bloom.
This plant is probably NOT native to New York City. The NYFA Atlas notes:
The native status of this plant is questionable. It is clearly planted and escaping in various areas. Some of the populations on Staten Island, and possibly elsewhere in southeastern New York, appear in "natural" areas. These may represent native populations, or they may be escapes from nearby residential developments.
Related ContentFlickr photo set
LinksNYFA Atlas: Plant ID 1531
USDA PLANTS Database: Symbol DIEX