Simple type of roof greening hand-drawn

Quick answer：

Roof greening refers to the process of creating green spaces on rooftops. It involves the installation of plants, soil, and other elements to transform a roof into a garden. The term 'simple type' suggests a basic or straightforward approach to roof greening, possibly focusing on ease of maintenance and cost-effectiveness. Hand-drawn implies that the design or illustration of this roof greening project is created manually, often as a preliminary step in the planning process.