The origin of this plant are the subject of debate with some authorities claiming it is native to southeast Asia, while others claim its origin is in northwestern South America. Fossil records from New Zealand indicate that small, coconut-like plants grew there as far back 15 million years ago. Even older fossils have been uncovered in Rajasthan, India. Regardless of its origin, the coconut has spread across much of the tropics, probably aided in many cases by sea-faring peoples. The fruit is light and buoyant and presumably spread significant distances by marine currents: fruits collected from the sea as far north as Norway have been found to be viable (subsequently germinated under the right conditions). In the Hawaiian Islands, the coconut is regarded as a Polynesian introduction, first brought to the Islands by early Polynesian voyagers from their homelands in the South Pacific.
The coconut palm thrives on sandy soils and is highly tolerant of salinity and prefers areas with abundant sunlight and regular rainfall (750 to 2,000 mm annually), which makes colonising shorelines of the tropics relatively straight-forward. Coconuts also need high humidity (70–80%+) for optimum growth, which is why they are rarely seen in areas with low humidity (e.g. the Mediterranean), even where temperatures are high enough. They are very hard to establish and grow in dry climates.
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