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Euphorbia characias ‘Tasmanian Tiger’ (photo courtesy of PlantHaven International, Inc.)
Euphorbia characias ‘Tasmanian Tiger’ (photo courtesy of PlantHaven International, Inc.)

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Zone
Zones 2B, 3-24, 26, 28-34
Full SunPartial Sun
Full, Partial
Regular Water
Moderate
Toxicity
Sap is irritating or poisonous

Euphorbia amygdaloides robbiae

Mrs. Robb’s Bonnet
Euphorbiaceae
Ground covers, Perennials, Flowers

EUPHORBIA

Diverse genus of about 2,000 species, ranging from small flowery annuals to sculptural trees. The 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. The 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 the 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 amygdaloides robbiae

Grows to 1 ft. tall, 1 ft. wide and spreading, expanding its territory by rhizomes and sometimes becoming invasive. Reddish green stems. Evergreen, 1–3-in.-long, dark green leaves have red undersides that turn darker red in winter. Greenish yellow flowers in clusters stem ends in midspring to early summer. One of the more shade-tolerant euphorbias.

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