Some tree tubes don't have a "top" or a "bottom," which is good in that they can't be installed incorrectly. It's probably also bad in that it means they lacked a specially flared rim designed to prevent abrasion of the tender bark of emerging trees.
Higher quality tree tubes do have an "up" and a "down." They have a specially made rim designed to protect the bark of emerging trees from abrasion. However it also means they can be installed wrong side up. In fact, I have seen tree tube brochures and web sites sporting photographs of tree tubes installed upside down!
Thankfully one of the top tree tube sellers in the US has posted a helpful blog post and video to clear up the up/down confusion!
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