I have a tiny back garden which is overlooked (most especially now that the leaves are coming off the Chestnut Tree in the neighbours garden). I want to plant something out the back fence to conceal my back garden somewhat but I do not want whatever I plant to take up too much space. Whatever I chose therefore needs to be tall (and flush with the fence to about 7") and then leafy (all year round) above that. Tall order I know but would appreciate any recommendations for a plant type that may fill that specification