Hi,wouldnt the best idea be to repot before the roots had chance to go
around and around and around. If only we new how long it would take to
fill up a 2inch increase in pot size,we would know when to repot to avoid
the above,or am i just dreaming? How long should it take to move up one
pot size of 2inches all around? Any ideas or do we just have to lift out the
pot and have a nosey? cheers

I've been following this posting since I first made it. I've read and reread the entire Topic a number of times

Myself I do not like using plastic. My Favorite is terra-cotta which I feel has it's advantages and disadvantages.

I find that many container citrus growers prefer a soil mix that is well aerated and draining, myself being one.

I support Millets postings 100% in the root development in hard surface containers , and would like to add that using ( Root control bags ) would help in aeration and drainage as well.

I also feel that the Root control bags would acclimate better for indoors vs the clay or plastic.

Thank You... Millet and all that made a posting. Dale

When a seed germinates, the primary root or radical quickly extends downward to support the developing new plant. In nature the tip of the taproot suppresses all secondary root development until its vigor begins to decline as oxygen and conditions for root functions deteriorate with depth. The tip of the taproot controls branching below ground much like the terminal bud controls branching above ground. If you want the top of a tree or a side limb to branch, cut off the tip. Roots respond the same way. Mechanical root pruning (cutting the root) and air root pruning (dehydration pruning of the root tip) work the same way, by taking away the chemical (hormonal) control the tip on the root has over the tissues just back from that point. Air root pruning causes multiple secondary and tertiary roots to develop, producing an excellent fibrous root system containing thousand of white root tips to absorb water, oxygen and nutrients. (Plant Production In Containers II) - Millet