I now have acquired twelve dwarf citrus trees. I am excited about the possibility of all the trees producing edible fruit! I currently have most of the trees in my greenhouse which can be seen in the following picture with the exception of one tree which is a Meyer Lemon tree that is currently being kept in partial sun outside. My collection consist of a Mexican Thorn-Less Lime, Variegated Tiger Orange, Variegated Cara Cara Orange, Variegated Calamondin, Cocktail tree of Key Lime and Meyer Lemon, Oroblanco Grapefruit (currently in bloom and smells heavenly!), Eldorado Miniature Peach, Bearss Seedless Lime, Cara Cara Orange, Trovita Orange, and my first producer of edible fruit...my Meyer Lemon Tree. I am currently in the process of re-potting all my trees in 3 to 5 gallon air pots. I mostly use a growing medium of 3/4 medium size CHC chips and 1/4 MosserLee Sphagnum Moss. I currently have three trees potted in air pots with a soil mix combined with ultimate potting mix sold by Wal-Mart.

Are those air pots in the first picture? How many gallons are they?

great pictures! Looks like the trees are liking the smart pots.

Yes, the trees in the picture are in air pots. The majority of them are in 5 gallon air pots. I have two trees in two gallon air pots. Tim.

Nice collection! What is the advantage of air pots?

Millet can explain this much better than I, however, I will give it a try. The air pots are built in such a manner that the roots are forced to grow towards the holes in the pots. The holes cause the roots to be air pruned once the root reaches the outer edge of the hole. When this air pruning occurs, the root will then begin new growth four inches down from the pruning point which creates a better root structure. They just happen to be a lot lighter than the other pots...a bonus..LOL. Tim.

This explains the advantage of Air Pots (Air Root Pruning Containers) - Millet (947-)

http://www.rootmaker.com/docs/4inchRuleWeb.pdf

The sizes of the air-pots are (on the Scottish site) given in liters.
1l, 2l, 5l.
This is maybe why you find them so light.

Thanks guys!

Sylvain, in the USA Air Root Pruning Containers (ARPC) come in the following sizes: 2X4 inch (used for seed germinating or rooting), 1 gallon, 3 gallon, 5-gallon, and on up to 300 gallon containers (using the 100-foot long Root Builder Expandable Rolls) I believe when Tim is referring to the light weight, he is not writing about just the weight of the container, but the weight of a container filled with the CHC medium. Due to the very limited sizes of Air containers offered by the Scottish, one could not even grow trees using Whitcomb System. - Millet (946-)

Are you speaking of the true air-pots?
"Air-pots" is a registered name.
http://www.superoots.com/air_intro.htm
And for USA:
http://aroidiaresearch.org/airpots/
http://www.growers-inc.com/air-pots.html

Yes you are right. They com in 1-2-3-4-5 gallons.
But it doesn't seem to be the ones on the picture.
It is hard to evaluate a scale on a picture but for me they are 2 and 5 litres.

Sylain, some of the confusion could also be between the pot that you pointed out, that is officially called "Air Pot", and another air root pruning container called Root Maker, the containers that I use. Root Maker Products Inc. have a much larger selection of available sizes (all the way up to 350 Gallon). Sorry if I caused any confusion. - Millet (943-)

http://www.rootmaker.com/