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A second flowering of the chestnut-tree, Castanea sativa, was observed in August 2022, in the Gaudinière Park, 44300 Nantes (France). Only one tree is concerned. New male catkins were formed following a first flowering in which bugs had been developed. The new catkins are fully expanded and other are green and in buds in mid-August. Some bisexual catkins change into young bugs. In early October, the harvest of chestnuts was poor. Bugs of the first flowering contained well constituted fruits. The second flowering, which has undergone high temperatures in late August and September 2022, has not evolved correctly; the few small bugs obtained contained malformed chestnuts. [ABSTRACT FROM AUTHOR]