Mowing head (11) with discs (21) for cutting plants, comprising: a supporting structure (13) defining a front portion (15) of the head (11), which encounters first the product to be cut when the head (1 1) moves forward on the ground in a working configuration for cutting plants, and a rear portion (17) of the head (11) towards which the cut product is conveyed for being collected or laid on the ground a cutter bar (19) having rotary discs (21) and associated with the supporting structure (13) at the front portion (15) of the head (11), perpendicularly relative to the advancing direction of the head (11) a conveying assembly (23) for the product cut by the cutter bar (19), adapted to convey the cut product from the front portion (15) of the head (11) towards the rear portion (17) of the head (11) wherein the conveying assembly (23) includes: at least a first, longitudinal conveyor belt (25a, 25b) for conveying the cut product in a direction parallel to the cutter bar (19), i.e. perpendicular to the advancing direction of the head (11) at least a second, transverse conveyor belt (27) for conveying the cut product coming from said at least a first conveyor belt (25a, 25b) in a direction perpendicular to the cutter bar (19), i.e. parallel to the advancing direction of the head (11).
