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I use these on seedlings or on new bench grafts that are directly planted in their final location. After 1-3 years depending on growth, I switch to aluminum window screen and fold it over with several layers on the s and SW side. Use the latex paint/water mix above and brushed over the window screen.
I have about 25 plus of these contraptions to give away if someone wants to pick them up in central Minnesota. Some will need new zip ties. Others are ready to be used.
They could also be used for red osier, hybrid poplar, or willow cuttings during the first year. I keep the open side to the north.