Our Cosco store is selling some terrific olive trees at the moment.

We now want to put ours in a bigger pot than it came in. Would a plastic or
earthernware pot suit it best? (from the water retention point of view,
rather than the look of it).

It looks like its been planted in ordinary peat type compost. We thought we
would replant it in John Innes No3.

Would you say that's the best soil for it please?