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The asymmetric unit of the title compound, 2C14H13N2+·2C4H5O6−·9H2O, contains two cations and two anions in addition to nine molecules of water. Each of the hydrogen tartrate anions is hydrogen bonded to itself by translation along [100] in a head-to-tail fashion via a short hydrogen bond with donor–acceptor distances of 2.473 (4) and 2.496 (4) Å. A large number of intermolecular O–H...O, N—H...O and C–H...O hydrogen-bonding interactions, as well as π–π stacking [centroid–centroid distances in the range 3.642 (3) to 3.866 (3) Å], play an important role in the crystal structure.