ArborGard+® Tree Trunk Protector
Prevents damage from trimmers, mowers, and rodents.
ArborGard+ Tree Trunk Protector
Polyethylene protector expands with tree growth and will not lose its shape even in the hottest sun. Holes in the protector allow bark to breathe and condition tree to prevent sun scald. A single protector fits trunks up to 4˝ in diameter. More than one protector can be joined together for larger trees. Dimensions: 9˝H x 4˝ diameter.
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These do the job in that they are customizable enough and allow for airflow, but they are a pain to work with. You have to bend them in the opposite direction to get them to open up, like one does a rolled-up poster. Then inserting the tabs is another huge pain, and forget it if you need to pull them back out and reposition. Then they curl into the tree's bark if the tree is more than like 2" in diameter, so you have to check them at least yearly to make sure the tree is not growing over them. All in all, though, these have been a lifesaver for landscape trees on a university campus that have been getting hacked to death by weed whackers.