Amazon has these. I asked about the wall thickness and a fellow shopper said that they are paper thin. Does anybody knows where I could find something like this in bulk that are actually well constructed?
In the 9x15 size I have over 700 fig specimens – many of them for at least 3 years with no degradation. I have about 3 dozen mulberries in the 10x20 size for about 2 years now. I have been reusing the 3x7’s and 5x12’s for over 3 years.
Pay attention to ribbing (desirable) and hole configuration when ordering.
I also use the Stuewe treepots, and they are well-made, but I wouldn’t necessarily say sturdy. It’s pretty thin plastic. I haven’t been reusing them for more than about 18 months (2nd use mostly, a few on their 3rd use), and a few of them are cracking a little around the drain holes. Still very functional, but I wouldn’t expect to get more than 3-4 years out of them.
I’ve been using the thin ones shown in your first photo for ages. They have not had any damage despite abuse.
Thicker isn’t necessarily better. I have a ton of rootmaker pots that are much better made. (Thicker, higher quality plastic etc) but they will break easily if you put something on top of it.