Many of the trees planted are issued from a few seeds received from China in 1948 and thus show signs of degenerescence, due to poor genetic diversity. I recommend to those who want to grow that tree to carefully check the origin of the plants (cuttings, seedlings and place where seeds had been harvested, etc.). It is possible to get fresh seeds to China (unfortunately too many are collected, endangering the natural seedlings of the remaining wild trees, which number less than 6,000).
Eleven specimen are living in the Naturetum de Sologne (http://www.naturetum.com/) so far, with at least nine growing very well. We intend to saw more with the aim to have at least one hundred trees of different genetics.
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