When left untouched, a crown of thorns plant can grow up to six feet tall and two feet wide. By cutting away older leaves, this will keep the plant a manageable size.

While Crown of Thorns is slow-growing, reaching about two feet in height when kept indoors, its spiky green leaves still pack a visual punch. This succulent is also quite simple to care for: here ...

However, as the name "crown of thorns" suggests, the plant is covered with 1-inch-long very sharp spines, which means it’s not an ideal plant to have in your home if you have curious kids or pets.

My first recollection of the plant crown of thorns (Euphorbia milii) was at my aunt’s home in the 1950s. I noted that the stems were covered with thorns and ended with vibrant red flowers.