Abstract: A manually operated ground cultivation tool is characterized by a roller assembly formed of one or more assemblages of a plurality of stacked disks that are each independently rotatably supported on a central axle. Each disk carries a plurality of radially extending tines. Each axle is supported by a yoke assembly that is attached to a shaft/handle structure. Each disk includes slots that are configured to accept nails as the radially extending tines. The disks accept different length nails in order to vary ground depth penetration as desired. The disks are preferably formed of a suitable plastic and as such, may be injection molded.