Posted: 14/05/2013 at 19:41
Planting them in a border soil is probably the best, but depending on how long they've been in the containers & how big they may be could make the job of digging out a large enough planting hole quite a task.
I've got 2 quite elderly box plants in containers that do need repotting. Instead I have removed a couple of inches of the top of the old compost & replaced it with new stuff- mine in this case, but John Innes no3 for permanent plants would be the best if you have to buy it in.
I'll also take some cuttings in June, when I do the trim & that gives me new plants for when I do need to replace the originals. J.