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Of course new trees from abroad have been introduced since, by humans. The Romans, it is thought, introduced the sweet chestnut. In Tudor and Elizabethan times, when there was a fashion for having large gardens in country houses other varieties of trees were brought over from abroad. The sycamore is an example. The real influx began though once the world expanded when the great naval explorers, like Christopher Columbus, returned from their tours, bringing with them examples of trees from other continents. Another big influx was during the eighteenth century when there was a craze for landscape gardening led by the garden designer Capability Brown. This coincided with an increase in trade with the far east and the tropics and more trees coming in from there.
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