Plume poppy, Macleaya cordata, Bocconia, Tree Celandine The Plume Poppy (Bocconia cordata, Macleaya cordata) is perhaps one of the most imposing plants of the hardy border, for it grows from 6 feet to 10 feet high. The general aspect of the plant is grayish-green in color with very large and deeply cut leaves. The flowers are not very conspicuous but […]