Shaun. This is a very difficult question to answer.
When a plant is potted in Clay, soil dries out must faster.
Did you say these pots were previously used? If not, I hope you soaked them..new clay absorbs water. In some cases, when watered, roots don't get enough water because of clay.

Garden soil. Was the soil dug from your garden? Most garden soils are either too heavy, too sandy, etc. Garden soil should be baked to rid disease, insects and weeds.
Is the soil well=draining? When you watered, did water absorb in the soil or linger on top? Toni

I would go to your local nusery a.s.a.p., and ask them what type of soil they pot theirs in and grab some...

Those questions toni asked are good ones! If you can say no to well draining, and yes to linger on top, then your tree will be dead as fast as you can blink an eye..:-(

If your looking for a long term potting mix, and plan on keeping the tree in a container for a while, then I would go to the "container forums" and look for what best suits you for your growing area.

Happy growing..

Mike

First of all when you dug up a citrus tree in Arizonia, and shipped it to California by Fed Ex,you broke the law. It is illegal to ship citrus trees into the state of California. I suspect the reason you sent it via Fed Ex, instead of bringing the tree with you when you flew back to California, is because you knew it was illegal. If I knew who you were, I would report you to the authorieties.

@ Silica, if you want to be a busy body, stay in California. Citrus Snob.

you do realize this thread is almost a year old.