Don't know anything about the plastic fabric containers. I would imagine that if nurseries are growing trees in them that they are UV-stabilized polyester, but I don't know. You might email the manufacturer and ask them how long the containers will last with full exposure to sun.

As for the plastic bags, yes, plants will grow in them just fine, as long as you add some drainage. The only serious questions I would ask about any reused plastic bag is 1) is it biodegradable plastic? 2) if I want to move the bag with soil and plant in it, will the plastic hold together?

Thank you, Jacqueinthegorge -- I like to experiment. You are right, I don't think the kitty litter bags would hold up to UV. I'm just going to break down and buy a couple of the 15-20 gallon poly fabric bags for two tomatoes. Will use Al's mix in one and MG mix without water crystals in the other. Should be fun. Thanks for your input.
Sunny

I am actually experimenting with containers made from felt. I am growing green beans in them.

I am also experimenting with a couple of bags made from a blue tarp. Growing peas and ?? mystery plant ??

How interesting, Locteach. Please let us know how they are doing and maybe post a photo or two?
Thanks.
Sunny

Please check out the Garden Galleries to see my fabric pots and blue tarp containers. I filed them under felt pots.

My felt pots are doing really well just wish I could turn them into self-watering containers. I am working on a new design now. My blue tarp bags have a cute little lip that allows the potting mix to remain in them. I continue to play with this design as well.