Shade has an unfortunate reputation. It's often spoken about as though it's a problem waiting to be solved. People apologise for it when I visit their gardens. "Nothing seems to grow there." "It's too dark." "I don't know what to plant beneath the trees." I understand why. Garden centres and gardening programmes tend to celebrate bright, colourful borders full of sunshine-loving plants. It's easy to come away thinking that a successful garden needs six hours of sunshine every