Table 1 Different depths support different vegetation forms
From: Vegetation composition of old extensive green roofs (from 1980s Germany)
| Depth (mm) | Vegetation form |
|---|---|
| 40–100 | Moss, sedum |
| 50–110 | Sedum, moss, herbaceous |
| 100–180 | Sedum, herbaceous |
| 150–250 | Grass, herbaceous |