Gooseneck loosestrife is a fast-spreading, softly hairy, rhizomatous, herbaceous perennial with erect stems. It bears 5-inch leaves that are ovate, pointed, lance-shaped, mid-green above, and pale green below. In mid- and late summer it bears saucer-shaped, dense, tapering white flowers stalks that are pendant before the flowers open but become upright with arching tips when the flowers are open. They are useful grown in areas where not much else grows, and can be used as cut flowers.