couls anybody suggest plants (preferably flowering) that I could plant on a very shallow bed of fairly clay soil. It is well drained though and in full sun. Thanks.
First improve texture to enrich the soil: add lots of manure or humus. Some sort
of fibre would increase its ability to retain moisture, which must be the hardest
thing to tackle. Some finely cut bark chips are excellent.
How shallow is it? If less than 4 inches, rather difficult.
Plants: lobularia, thyme, globe daisy (globularia cordifolia), purslane, Livingstone
Also check for various alpine plantas, like Violas, Gentians and Sedums.