The patented root protection by Bio Green protects palms and more from frost and wind The patented root protection by Bio Green preserves the sensitive root area of valuable palm trees from frost and wind. If they are not adequately protected, the roots of potted, even frost-hardy, palms, often freeze. This is where our root protection comes in: the double air cushion foil insulates and is breathable. The practical lace fastening guarantees effective rain and snow protection while the ground anchoring ensures a firm hold. Get your palms safely through the winter!