Quote:
Originally Posted by tom77falcons
Old world easily. Things moved east to west from China over to Europe also. Asia/China is the goldmine of plant diversity. Many of the good fruits come from there. Oranges and bananas of course and many others. China blows away North America.
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We are well over a century past efficient international travel and movement of goods. Asian and European plants are exceedingly common in North American gardens and North American plants are common in European and Asian gardens.
I would say the most diverse gardens are defined by hardiness zones rather than continent. Warm subtropical gardens in reasonably well watered environments (think southeastern US, southern Europe, southern China and equivalent latitudes in the southern Hemisphere) are probably capable of the greatest diversity of plants from around the world, and gardeners, the world around, are notorious exoticists.
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