Posted: 16/06/2013 at 09:38
It does sound like the'yre not happy in your soil, though you could try giving them an acid-type feed over this season. It really depends on the age and root run of the plants. I think you'd struggle to move well established Rhodos to pots, but if they're struggling now I think you've nothing to lose by trying.
I love Rhodos and grow mine in pots. Just to try and persuade you they're worth the effort, I have a 30-odd yrs old one which I've just re-potted over the years into bigger and bigger pots.While most (but not all) have a small flowering season, there's not much can compare.
A bit of root pruning will probably be needed. Yes ericaceous compost is a must, then water in some sequestrene or suitable fertiliser. Give it a go, you've nothing to lose!