Euphorbias are a versatile group of plants made up of more than 2,000 species, ranging from tiny succulents to tall trees. Their unique beauty, easy care, and adaptability to various growing conditions make them a popular choice for gardeners. Euphorbias are drought-tolerant and thrive in well-draining soil and full sun. Among the most famous species are the Crown of Thorns, Poinsettia, and Pencil Cactus. The Crown of Thorns, or Euphorbia milii, is a resilient succulent with several large-flowering, Thai Giant hybrids that come in a range of flower colors. Ease of care make it a favorite plant for indoor gardeners. Grow in full sun and well-draining soil. (View Euphorbia plant care information.)