Trace Oswald wrote:
According to the site, they are made from recycled water bottles and natural fibers, whatever they mean by that.
My concern exactly. This spring in an effort to get my squash off to a good start, I made several of the pots in the picture below out of "organic coffee sacks" from a local Fair Trade company. The sacks are treated with some sort of oil, but I'm not sure what else. I tried using coir pots, but they didn't seem to let the roots through as quickly as I'd like. This is my first year, so I can't give you a report on the plants (which I know got off to a bad start due to weather weirding... sigh...) or how quickly the pots decompose or allow the roots through. Also, although what I made is firm enough for the ~4" diameter and 4 1/2" height, I don't know if they'd upscale to the ones pictured on the homepage of the link you provided which is why I wondered how large the one was that you showed. I did see pictures of the Root Pouches inside a plastic pot which might be a solution.
I know that in a perfect world, seeding the trees straight into the ground has much to say for it, but I've got very limited sunshine, so I need to adapt my approach to what I have to work with!