The main design purpose of the rotary tiller is to break the soil or compact the soil for the new vegetable garden, flower bed, or lawn. They can also be used in furrows to sow seeds or seedlings and to dig planting holes.Rotary Tillers are sized right for portable tractors and also are made to till soil for seedbed preparation. The rotation tillers tend to achieve greater deepness of penetration, moving and also pulverizing more dirt while doing so, while hiding residue rather than leaving it on top.