Can anyone identify this plant which is growing in a friend's garden in the Uzumlu area of Turkey. It has very large spikes/thorns. I'm told it doesn't have flowers or seeds so we are wondering how it propagates itself.
This is a palm (family Arecaceae). Many palms have spines; I'm no expert but it looks to me like it is a member of the Phoenix genus, perhaps a Cretan date palm (Phoenix theophrasti). Date palms do propagate themselves by seed (the pit of the date fruit). The palm in your picture, if a date palm, would be rather young, which could explain why it does not presently show flowers or fruits. Here is a photo of the spines and flowers of a Cretan date palm (by Wouter Hagens, from Wikimedia Commons):