Posted: 05/12/2015 at 22:11
I live in an area of France where sweet chestnuts grow. The way to tell what sort they are is to open the shell and look at the nut.
Marron (in French) is a large sweet chestnut from a cultivated grafted tree. The nuts are large and round, all in one piece, they are used to make "marrons glacés".
Chataigne is a wild sweet chestnut. The nuts are smaller and divided in three. They are good for making chestnut flour and for mashing up in stuffings.
The above 2 have very, very prickly casings.
The other sort of chestnut is a conker in English, Marron d'Inde, which is toxic, round and shiny.