Olive trees are ancient plants. Archeologists who have found olive pits and traces of olive oil in pottery shards estimate we’ve been cultivating them for 6,000 to 8,000 years. Not all of us can grow these trees for fruit or oil. They’re hardy only in USDA zones 8 and warmer, and start to die when temperatures hit the mid-teens. Tend to love the UAE heat and strive during summers.