He went on to develop the garden tool himself. Parks would go on to invent the 'Speedy Weedy', a lawn and garden tool. Spear & Jackson, the garden tool company, are in the north of Sheffield. In some places, the machete may be used as a garden tool as well. A daisy grubber is a garden tool that is used to pull out roots. A grafter, or grafting knife, is a garden tool used for grafting fruit trees.