geez. I wonder if you know who might be selling them ? I hate to be a nay sayer, but, I'll bet they won't work for palms.

I have looked into the High Caliper (tree bag) system and believe they would work well, at least I intend to find out this coming spring. I grow trees too and will be trying some of the below ground bags as well as the above ground for several different oaks and palm species. It's my understanding that a small portion of the roots will penetrate through the bottom of the pot but such as to not harm the tree when moved and can be shipped or trucked in the bag.It is probably necessary to use a heavier mix above ground because they are designed to allow some air to the root and would tend to dry out quicker but keep the root ball cooler. The plastic pots get too hot when my temps stay above 100 for months at a time.I intend to use a drip system. You can contact them for help with anything you intend to use with them such as potting mixes and fertilizers. They will also send a free CD of their usage. Yes, they are out of Oklahoma City and no, I am not affiliated with them in any way. But I am close enough to pick them up.

Here is a link that might be useful: High Caliper smart growing system

Thanks for the link, donray. I am going to email them and see if they think palms will do well in these smart pots.

It is good to know that the company is so close; most likely situated about half way between your location and mine.

Interesting concept .