Some gardeners prepare an area by removing the existing top soil and grass.This can be done with a shovel, hoe or sod-cutter machine.But live roots or weeds might remain below the surface.

• 有的园艺者开辟田地时，移去表层的土壤和杂草，这个可用铲子、锄头或草皮收割机，但是活的根和草籽可能会在地下保留着。