Crown of thorns, also called Christ thorn, thorny plant of the spurge family (Euphorbiaceae), native to Madagascar. Flowering is year-round but most plentiful in wintertime in the Northern Hemisphere. Crown of thorns is popular as a houseplant and is grown in warm climates as a garden shrub.
The crown of thorns is poisonous again.
Ingestion of any part of the crown of thorns causes toxicity. Although Euphorbia milii is generally considered an ideal houseplant. This Euphorbia is known to be toxic to humans, cats, dogs, horses, and sheep. However, you need to exercise caution if you are growing this species in your house, particularly if you have children or pets because it contains phorbol esters, which are poisonous. Ingestion of any part of the crown of thorns causes toxicity.