Flower is technically a cyathium, consisting of fused bracts that form a cup around the much-reduced true flowers. Cyathia may appear singly or in clusters. In some cases, as with poinsettia (E. pulcherrima), additional bracts below provide most of the color. Fruit is usually a dry capsule that releases seeds explosively, shooting them up to several feet away. Many euphorbias are succulents; these often mimic cacti in appearance and are as diverse in form and size.
All euphorbias have milky white sap that is irritating on contact or toxic if ingested (degree of irritation or toxicity varies, depending on species). Before using cut flowers in arrangements, dip stems in boiling water or hold in a flame for a few seconds to prevent sap bleed. All need well-drained soil.Euphorbia palustris
From Europe, western Asia. Forms robust clump to 3 ft. high and wide, with many medium green, 2–3-in. leaves that turn yellow and orange in fall. Wide-branching clusters of yellow flowers in spring, early summer. Dies back in winter. Self-sows. One of the few euphorbias that will grow in damp or boggy conditions; also does well in ordinary garden soil, whether dry or moist.
Native to Korea and Japan. Resembles climbing hydrangea (Hydrangea anomala petiolaris). Climb...
Native to Japan and Korea. Can be a big multistemmed shrub or—with training—a small tree t...
Grows 20–25 ft. high and wide, with a roundish crown of 3-in.-wide, glossy green, three-lobed le...