Thanks, I"ll have to look into this a bit more.
You really need to get hold of a copy of Patrick Blanc's book. I got it out of the library first, then I bought it. I've been interested in vertical gardens for years, and Blanc's method is by far the best IMHO. Especially If its combined with a fish pond, then it becomes ornamental aquaponics.
Most of the plants are planted in just the cloth, but I planted a few in small pockets with some potting mix. Time will tell if it makes any difference.
The capillary cloth is white and kind of like dense polyester wading like the stuff used in filters. I only used it because I couldn't find a supplier of the grey irrigation fabric
blanc uses.
I think that a lot of people are a bit put off by the reliance of a pump and a timer, and the chance of it breaking down. But the pump actually makes it much more low maintenance. No watering just feed the fish and top off the pond now and again..
? I've never even seen a frost where I live.
There are plenty of examples of P Blanc's gardens in Europe that survive the winters over there, and he does mention the non woven cloth not being damaged by freezing.