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?
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 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 retrieved from silive.com:
Here is a picture of the plant.
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: