The plume poppy or bocconia is a fine herbaceous perennial plant, growing 6 to 8 ft. high, with glaucous leaves and long plumes of buff-colored flowers. It loves a deep, moist, substantial soil, and thrives in well-tilled clay. It is effective if a small clump of it is grown in an isolated position as a form of lawn decoration. Propagation is by division in autumn or spring under glass, and by pieces of root laid in shallow boxes of gritty soil in a frame in spring. Pron. Bok-coney-er.