I am planning on creating an "urban oasis" on my rooftop patio but have no idea where to start! I am a beginner so am hoping someone could recommend a good book to me. The patio is tiled so everything would be in containers. Also, any starter tips anyone has would be great. Since it is on the roof with full sun I need things that can stand up to the heat. I love the look of modern/minimalist gardens so want to use a lot of grasses as opposed to flowers.