Ask The Expert: I was given a very old plant i want to identify. It is very old I was told it is a type of Christmas cactus but I have never seen one before with thorns like a rose. It is very pretty but driving me crazy to find out what it is and proper care for it to bloom. Thank you for your help in advance. Flower Shop Network's Plant Expert Reply: Not 100% certain, but I'm pretty sure this is a Euphorbia milii also known as a crown of thorns plant or Christ plant. (If anyone has a better ID, please leave a comment!) E. milii is a succulent shrub and can grow to be about 6.5 ft. The plant produces beautiful flowers throughout the year that can be pink, red, yellow or white. Euphorbia milii Care & Maintenance Place your crown of thorns plant in a warm and sunny location all year. In the summer, it can be kept outdoors, but sheltered. Water your Euphorbia milii moderately. During peak growing season, spring to fall, feed it cactus food regularly. Use [...]