Related Clues:

• Slab of peat
• 19-Across (with "Old")
• Square with roots
• Green topper
• Landscaper's cover
• Layer of ground
• Plot thickener
• Artificial grass
• Fairway makeup
• Course material, maybe
• Farm product bought in rolls
• Grass grown on farms
• Roll of turf
• Landscaping supply grown on farms
• Field covering