Possible Clues:

• Upper layer of earth
• The cover on the bed
• Plow's target
• Slave admitting work uniform's missing -- it's on a bed
• Work's inside and out which is good for plant
• Earth for farming
• Cultivated dirt
• What's in spit surpasses the normal lubricant?
• Mishits ball badly, losing some length where grass grows
• Nursery purchase