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Missouri Botanical Garden PlantFinder lists Olea europaea for USDA Zones 8 to 10 in full sun, with medium water and medium maintenance; height 20-30 feet and spread 15-25 feet, blooming white in June to July, and tolerant of drought.
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Missouri Botanical Garden PlantFinder notes best performance in Mediterranean-type climates (hot-dry summer, mild-wet winter) such as California, and that trees are not winter hardy to the St. Louis area, where they are best grown in greenhouses, conservatories, or overwintered containers kept cool (40-50 degrees F).
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Not native to North America — Missouri Botanical Garden PlantFinder gives the native range as the Mediterranean region. Olea europaea is naturalized and locally invasive in parts of California and Australia, so site it where escaped seedlings will not spread into wildland.