Posted: 28/09/2012 at 08:18
Hi Eddie, I agree with the others not to do any more black painting. I have also got a north-facing garden with clay soil and the plants that do well are (amongst others) hollies (variegated would be good in yours), yew, Euonymous, rhododendrons (not the invasive ponticum), Spiraea varieties, roses, irises, and for ground cover hardy geraniums and variegated ivies, plus any number of bulbs and most hardy perennials, so don't despair. Many perennials can be grown from seed, or beg cuttings or divisions from friends and neighbours - any gardener would be happy to help out. Good luck!