We saw photos of macro-pots in a newsletter of the South Australian
Rare Fruits Association. We copied the idea and added the five
wicking elements:
.  water holding liner,
.  reservoir,
.  fill pipe,
.  overflow and
.  mulch.

We use them to grow fruit trees on the Espalier system. As this is
new to us, we have not much experience to share as yet, but are
happy with the results so far.

Our macro-pots are made of wire mesh used for crab-pots, weed-
matting and fencing clips or C-clips. We added a bottom plate made
from the same mesh to stop bulging.
We to use them for fruit trees and sit them on bits of hardwood leaving
enough space for the forks of a forklift. That way we can take the
trees with us if we move.
(In commercial nurseries the pots sit on small pallets and can be
shifted easily, but pallets are a bit expensive for us.)

We then extended the idea to small wicking beds. As the beds can
hold up to 280 litres of soil, they are no longer portable.

The sizes are chosen to make the most of a 30m roll of crab-pot wire,
1,200 mm wide. Its squares are 75mm along the length of the roll and
50mm along its width. One square gets lost when cutting, which
means that we finish up with slightly different sizes.

We make the pots in batches of four and the beds in batches of three.
By doing that and by buying full rolls of wires, weed mat and plastic
we keep the cost down.

The cost of four pots (May 2014) is about $52 or $13 per pot. A pot
holds about 140 litres of soil.

The cost of three small beds is about $42 or $14 per bed. A bed hols
up to 280 litres.

(Warning: the pots and beds have many sharp points where the
wires have been cut. These can scratch while working with them.
Some people may prefer to file these points.)
Click here for detailed descriptions of how to make them.