Wood Fibres Naturally Lock Together Around Plants Which Stops Weeds Penetrating The Soil And Taking Hold In Your Prized Flower Beds. The Fibres Even Prevent Weed Seeds From Germinating Let Alone Growing To Keep Your Weeding At A Minimum So You Need Only Spend Your Time Watching Your Flowers Flourish.the Locking Together Of Wood Fibres Is To The Degree That Oxygen And Moisture Can Get To The Roots