Abstract: A distributor of horticultural seeds for a sowing agricultural implement, comprising a casing (10) and a disc (20) rotatably mounted inside the casing (10), dividing the latter into a seed chamber (CS) and in a suction chamber (CA) maintained in fluid communication with a suction device and selectively and adjustably connectable with the atmosphere, said disc (20) having at least two rows of holes (21, 22), each comprising a selector (50, 60) having a leading edge extension (51, 61), which is selectively displaced, in order to interfere, upon rotation of the disc (20), with the path of a predetermined part of the seeds which are pneumatically carried in each hole of the respective row of holes (21, 22), so that each hole enters the discharge chamber (CD) carrying a desired number of seeds, the discharge chamber (CD) being opened to discharge channels (15, 16) arranged in such a way as to receive the seeds released from a respective row of holes (21, 22), when they enter the discharge chamber (CD) and to direc