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The majority are found in Southern Africa but there are a few that come from Mexico, such as Beaucarnea. South America is likely to have a few, too. These are all adaptations to a climate where it rains a fair bit for 2 months of the year, more lightly for about 5 and can be hot and bone dry for the other five

We are lucky here only get a dry spell in Summer. But last Summer we had plenty of rain