Stuewe still sells a 4" x 8" Pioneer pot but it appears they don’t sell the carrying case/flat. You must have the round ones that are discontinued then?
I have those, the PP48. They’re selling off the remaining inventory.
I like those ones because they were about the same size as an Anderson band pot, but they have root pruning on the sides as well, not just the bottom.
They work great for oaks, redbud, and blackgums, i’ve also used them for Metasequoia. I would imagine they might even work for fruit tree rootstocks.
They should work well for anything that grows to a decent size in the first season, especially with a strong taproot, and would also work really well for things like hickories, pecan, and walnuts.
This year’s pawpaw seedlings coming up since 10-12 days ago. These are the ones @Lucky_P offered and I planted a 100. I’m really liking Deepots from Stuewe & Sons. These are 14" long pots.
And last years attempt at growing persimmons seedlings in 1/2 gallon grow sacks bought from eBay. I thought I’d get tremendous growth but it was laughable. Now they’re potted in plain old gallons and are for me so I’ll fix the roots at planting time. These are all seed that came from Jerry Lehman’s orchard when I got the opportunity to meet Jerry during the Fall of 2017.