John 19:2 (HCSB)
The soldiers also twisted together a crown of thorns, put it on His head, and threw a purple robe around Him.
Image from The Passion of the Christ.
What was the actual thorn plant that was used in Christ's crown of thorns?
We do not really know but bramble is a common thorn in Palestine:
From 'The Plants of the Bible' there are a few other options to choose from as well:
The thorn plant that was used to make the "crown of thorns" which was placed upon the head of Jesus, is believed to be a plant called the "Euphorbia milii."
I actually have a cutting of this plant which is in a pot (and growing). It is about 50mm in height, has yellow flowers and the thorns are already appearing up the whole stem, and measure about 5mm.They are also very pointed and sharp.The plant is a climbing variety and will grow to a height of 1.8 metre.At this height,one can assume that the thorns must be at least 30mm long and "very sharp."
Below is information i have retrieved from the internet about the crown of thorns.
Euphorbia milii, commonly known as Crown of Thorns, is a member of the Euphorbia, or Spurge family, which includes the poinsettia and castor bean plants. Grown as a garden plant in warmer climates, in our area it is strictly a houseplant.
What we think of as flowers on Crown of Thorns plants actually are bracts, brightly colored modified leaves found beneath the small, inconspicuous flowers. Most of these succulents have red bracts, but many varieties can be found in all the warm colors, including pink, coral and yellow.
The word “Spurge” comes from purge or expurgate, which refers to the fact that it is poisonous if the sticky white sap, or latex, is taken internally in large amounts. Since some people are susceptible to this latex and may develop a rash similar to that caused by poison ivy, it’s advisable to wear disposable gloves when handling the plant.
The sap, as well as its sharp thorns, protects the Crown of Thorns from animals that otherwise would devour the plant entirely. The plant’s name alludes to the legend that at His crucifixion, a wreath or crown made from stems of this plant was placed on the head of Christ. As they are pliable, the stems conceivably could be intertwined and shaped into a circle.
Native to Madagascar, Euphorbia milii (formerly named Euphorbia splendens) was brought to the Middle East before the time of Christ, so it is quite possible the legend could be true. http://cdn2.arkive.org/media/91/91B49959-4E7D-4A0B-B833-D388263111C5/Presentation.Large/Crown-of-thorns-in-flower.jpg