Trousseau is one of the two main dark-skinned wine grapes in Jura, eastern France. Despite its importance in the area, it covers only five per cent of vineyard space due to the high level of sunlight it requires. It is also particular about terroir, growing best on soils of warm gravel or marl. It is mostly grown in Portugal, where the 1,218 hectares of vineyards it covers are mainly used to produce port wine. The wines produced from Trousseau tend to be deep in colour with a high acidity and alcohol. They are often well structured and powerful.