The polypropylene underlay that eliminates contamination. It inhibits the weeds, and by controlling moisture, protects the roots from the growth of fungus and bacteria. A woven fabric instead of a film. As water seeps through, the drainage is controlled, affording moisture without puddling from which fungus disease attacks the roots. Resists tear and puncture. The fabric can be stapled or staked to the ground. Blue lines every 12" for easy spacing.