Sweet Chestnut 'Marion de Lyon' is a cultivar of the Castanea sativa tree, renowned for its exceptional nut production and ornamental qualities. This deciduous tree is characterized by its robust growth habit, forming a broad, rounded canopy that provides ample shade. The most notable feature of 'Marion de Lyon' is its prolific nut-bearing capacity. The sweet, edible chestnuts produced by this cultivar are large, plump, and flavorful, making them a sought-after choice for culinary purposes. The tree typically begins to bear nuts at a relatively young age, adding to its appeal for those looking to enjoy a relatively quick harvest.