I have some shaded areas in my garden,one area I refer to as the woodland garden,this area is under a huge maple which I've named the devil tree, because of the thousands of little trees which have come up allover the garden this spring.I think this might be because of the wet weather in spring, because last year I didn't get any and we had at least 6 weeks of hot dry weather anyway all sorts of woodland plants do well,I have a watering system in it for very dry weather but I find a good few inch or pine bark works for most of the year.Under a silver birch on the other side is very different, its heavy clay soil dries out to a very hard cracked surface but 3 plants which do very well are Pulmonaria(lungwort)which is so bright and lovely,Aquilegia which come in so many colours and Hardy geranium and the best thing about these three is the slugs and snails leave them alone,unlike the woodland flowers which I've started visiting at dark looking for slugs and snails.