The invention relates to the field of monocrystalline casting, and in particular to a mold (1) for monocristalline casting comprising at least a molding cavity (7), a starter cavity (10) having at least a first volume (10a) in the form of an upside-down funnel, and a distinct second volume (10b) forming a plinth at the bottom of the first volume and projecting perceptibly relative to said first volume in at least one horizontal direction, a selector channel (9) connecting said starter cavity (10) to said molding cavity (7), and a support rod (20) that is laterally offset relative to said selector channel, and that connects the second volume (10b) of the starter cavity (10) to the molding cavity (7). The invention also provides a casting method using such a mold (1).