A rhizomatous perennial water plant, reaching up to 4 ( usually 2 ) feet in height, that is native to eastern North America.
The heart-shaped leaves, up to 10 x 6 inches, are glossy deep green.
The mid-blue ( with yellow eye ) flowers are borne on sturdy, stout spikes from early summer through mid autumn.
Hardy zones 3 to 8 in full sun to partial shade in permanent water from 0.5 to 12 inches deep.
* photos taken on Aug 1 2011 in Luzerne Co., PA
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