Whether your garden is a vertical landscape design or an urban landscape design it will require some maintenance. A landscape designer can design a low maintenance garden, but there is no such situation where it could be a no maintenance landscape or no maintenance garden design. Even a concrete slab requires some maintenance as over time it needs cleaning and over time it cracks and therefore will be in need of repair due to the freezing and thawing effects of winter.
If you are looking to have low maintenance gardening, you should choose plants specifically that are low maintenance plants. Ornamental grasses are extremely low-maintenance. A vertical landscape design that is composed of ornamental grasses will survive well in the harsh culture of a roof garden provided it is irrigated properly.
It’s easier than you might think!