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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
  1. Adapted from FLL (2008, p. 43).