Posted: 03/05/2014 at 11:51
I don't think Philippa's advice was against a shallow pot, just that it won't last as long. If you like them in the shallow pot keep propagating and replacing them. They'll look better like that.
Grit is what you need in the potting compost. Lots.
I've never done it to thyme but I propagated a dianthus by burying it in a few inches of gravel left over from concrete making. Very successful