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Tree Tubes at Work An experiment in the Hong Kong hillside lasting 3.5 years, measured the height, crown diameter and basal diameter of newly planted trees after tree tubes and weed mats were applied, resulted in a larger survival rate and improved growth times (Lai and Wong, 2005). During their growth period, the trees could not grow outwards, which resulted in an acceleration in upward growth. This upward growth reduced tree diameter for a short time while the tree was surrounded by the tree tube, but when the tubes were removed, tree diameter, stem thickness and outward growth exploded. Accelerated growth from the tree tubes along with weed protection from the weed mats, resulted in a larger height, basal diameter and crown diameter in all trees tested, as shown in the graphs from (Lai and Wong, 2005).
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