Latroun Monastery, home to Trappist monks, is the only place in Israel I have ever seen poinsettias growing.
These are pictures from last December.
Here's the story (from Wikipedia):
"The plants' association with Christmas began in 16th century Mexico, where legend tells of a young girl who was too poor to provide a gift for the celebration of Jesus' birthday. The tale goes that the child was inspired by an angel to gather weeds from the roadside and place them in front of the church altar. Crimson 'blossoms' sprouted from the weeds and became beautiful poinsettias. From the 17th century, Franciscan monks in Mexico included the plants in their Christmas celebrations."