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The first time I saw anything like this was a gentleman who designed bags like this for orchards. I was really excited then, so I’m sure you can imagine how happy I was when I saw these!
I received a 3-pack, set them up, and tried them for a week. This is how I setup the second package I bought. These are really easy to setup and use. These are designed to be used during the growing season and stored during the winter.
Each bag holds 20 gallons of water. For established trees, you fill once per week. For new trees, they recommend twice per week.
One bag is designed for a trunk between 1-inch and 4-inches. For trees larger than that, you need to zip bags together. These are fantastic and I can’t wait for my in-laws to move so I can buy some for their new trees!
I do not know if there are any long-term implications for the trunk of the tree being shaded. As for root rot, if water remains on the roots long enough to rot the roots, you may not need these bags.