I use these and they seem to work very well. I just planted 70 sawtooth oak seedlings two months ago and as of today, I have 100% still alive and growing. We are in extreme drought to boot. My trees average 12", tubes are 48" to give them a chance with a high deer population.

https://www.amazon.com/dp/B077Y3KW7R?ref=ppx_yo2ov_dt_b_product_details&th=1

Last edited by weekender7; 05/15/22.