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Stop Bamboo in its Tracks! Bamboo Shield is a diversion type control method with a smooth surface on the side facing your bamboo planting. It is made from HDPE high-density polyethylene. Superior to metals because it will not rust and easier to install. Bamboo roots typically travel in the first 12-18 inches of topsoil. Bamboo Shield is sold in 24″ 30″ and 36″ depths to provide extra protection from stray growth. The polyethylene barrier has been made from recyclable post industrial regrind material when possible. Plastic thinner than 30 mil has been shown to crack when ground temperatures get below -15 degrees F. This would be extremely cold and the thickness greater than 30 mil does great at handling very cold temperatures without damage. The plastic barrier has a better chance not cracking when frozen like other materials. Even concrete will freeze and crack over the years. Driveways are poured 4 to 6 inches deep to allow heavy vehicles passage and parking. Seldom are driveways seen without cracks. Concrete was many years ago Byron Agriculture Station in Byron Georgia as a below ground barrier system and found to crack below the frost line allowing bamboo rhizomes to emerge through to the other side. One of the many myths of bamboo is its ability to crack solid concrete. Bamboo is not magical but persistent and its root system will eventually find cracks in concrete and emerge through them. If the environment sunlight soil is suitable once it emerges the bamboo will grow if not terminated. The rhizome root when growing is very soft and flexible and will always turn when it encounters something harder. Furthermore installation of a barrier will accelerate the grow of a bamboo screen. The growth will be more dense because of the confinements and stimulate the screening effect.