Abstract: A material mixing apparatus having a cylindrical mixing bowl within which there is disposed a rotary, power-driven, mixing assembly embodying a cylindrical turret which embodies an upper extension and carries about its periphery a series of material mixing components including lift plows and material cutters. When the apparatus is used for mixing materials which combine and liberate heat because of the addition of water or other liquid, the added water or other liquid is applied to the turret and its extension for wash-down purposes in order to avoid the creation of indestructible solid lumps in the material undergoing mixing. A novel turret configuration and a novel plow and plow holder arrangement which accomplishes efficient material agitation and folding within the bowl, constitute the principal features of the present invention.