If there is too much shade in a garden, fret not. A simple beautiful sustainable design can still be done, as shown by this narrow planting strip along Queen Street near to the Bras Basah circle line MRT station. Of course, it helps if there is some light streaming in. Low light conditions are not the same as no light. I don't think there are any known plants that can live in constant darkness. I mean, how can they photosynthesize in the dark?