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The powdery nature and high alkali content of vegetable ashes make them idealraw materials to be used as modifiers of silicate compositions (glasses,enamels and ceramics). Their utilisation since ancient times is described inthe literature of the history of glasses, but studies on the analyses of theircomposition are still limited. We discuss here the compositions of tree andshrub ashes (wattle, hawthorn, oak, green oak, olive wood, elm, poplar, appletree, vine shoot), of plants (carex, fern, dogwood), of cereals (wheat, maize,rice), threshing waste and hay, mainly harvested in Maconnais, near Taiz\'e(Sa\^one-et-Loire, France), by the potter Brother D. de Montmolin. Thecontributions in alkali modifiers (Na2O, K2O), alkaline-earth (CaO, MgO) and insilica are discussed in view of the data gathered from the literature of thehistory of techniques used in the production of ceramics, enamels and glasses.The huge variation in composition is usually attributed to recycling and isquestioned by the very broad range of compositions that we obtained in theanalyses of the ashes.

Les cendres v\'eg\'etales, mati\`eres premi\`eres des verres et des  \'emaux : un exemple, les cendres de v\'eg\'etaux utilis\'ees par Fr. D de  Montmolin