1. A harrow attachment for cultivators comprising the combination of a spring tooth shank of a cultivator, said shank having bores intermediate its height, a horizontally disposed tube, said tube having a mounting plate fixed across the rear of the tube and extending tangentially upward therefrom, said plate being positioned against the rear face of said shank, said plate having bores in alignment with said shank bores, bolts passing through said bores in said plate and said bores in said shank to fix said plate and tube to said shank, an elongated cylindrical member, said member being mounted in said tube centrally of the length of said member, said tube having a threaded bore, a bolt threaded into said bore in said tube against said member to lock said member to said tube, a pair of elongated rods each having their lower ends extending downward to form harrow teeth with their upper ends wound around the opposing outer ends of said member and with each of said upper ends terminating in a loop on said member, said member having a plurality of bores aligned in a row along each outer end of said member, a bolt at each outer end of said member passing through said loops and through one of the plurality of bores at each of the outer ends of said member to lock said loops of said rods to said member, said member being rotatably mounted in said tube whereby said bolt threaded into said tube may be loosened and retightened to rotate the member to different angles to adjust the rods to different angles relative to the shank.