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Qinghai-Tibet Plateau

Here is Qinghai-Tibetan Plateau, where it is called
“the Roof of the World”, “the 3rd Pole of the world”, and one of the SUPER CLEAN AREA, no pollution, no industrial damage, clean & pure.
 Meanwhile, here also have other features: altitude over 2800 meters, extremely lack of water, very dry, rare air, big temperature difference between day & night up to 10 , strong sunshine up to 12 hours per day.
All these factors guaranteed the plants here suffer very few plant diseases and insect pests.