How many do I need to use for my project?

The quantity will vary depending on how many openings you have for plants, shrubs, or trees and the shape of the area you are covering. A general rule of thumb is to use a staple or peg wherever the fabric overlaps and place them approximately 2 to 3 feet apart. Also use staples or pegs to hold fabric down around plants and shrubs. The objective is to keep fabric close to the ground, and the soil completely covered; the less exposed soil, the better your protection against weeds.