1. Explore – Foundations of Green Roofs and Vertical Gardens
Urbanization, while offering numerous opportunities, also presents significant environmental challenges, including habitat loss, increased urban heat island effect, and reduced air quality. Green roofs and vertical gardens emerge as innovative nature-based solutions to these issues, integrating vegetation directly into the urban fabric.
1.1 What are Green Roofs and Vertical Gardens?
A Green Roof, also known as a living roof, is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane. They can be categorized into two main types:
- Extensive Green Roofs: Characterized by a shallow growing medium (typically 2-6 inches deep) and low-maintenance, drought-tolerant vegetation such as sedums, grasses, and wildflowers. They are lightweight and require minimal irrigation once established (Snodgrass & McIntyre, 2010).
- Intensive Green Roofs: Feature a deeper growing medium (6 inches to several feet deep) and can support a wider variety of plants, including shrubs and even small trees. They require more structural support and maintenance, often resembling traditional ground-level gardens (Mentens et al., 2006).
A Vertical Garden also known as living walls or green walls, vertical gardens are systems where plants are grown vertically on a specially designed structure attached to a wall, either freestanding or as part of a building. They can be:
- Panel Systems: Plants are grown in individual modules or panels that are then attached to a support structure.
- Trellis Systems: Climbing plants are grown up a support structure, such as a trellis or cables, rooted in a ground-level planter.
- Hydroponic Systems: Plants are grown without soil, using nutrient-rich water solutions.