Green Roof System "Perennial Garden" – the Ideal System for Blooming Perennials and Fragrant Herbs

“Perennial Garden” is a simple intensive Green Roof system and allows for the inclusion of various perennials and small shrubs in the plant selection. Compared to extensive Green Roofs, the larger capacity of the drainage layer and the thicker layer of growing medium facilitate this broader plant palette.

Apart from low-growing Sedum species, the plant community “Perennial Garden” also contains fragrant drought resistant herbs and small shrubs, like thyme, oregano, lavender and ornamental grasses, which can be completed by colorfully flowering species using a special planting design.

For this semi-intensive Green Roof, the ZinCo Floradrain® FD 40-E water retaining- and drainage element is combined with the ZinCo “Zincoblend I” growing medium specifically developed for this plant community, to create the right growing conditions for the various species of this type of Green Roof.

By shaping the growing medium, it is possible to create a varied appearance. Various designs and combinations with walkways and patios are also possible. The "Perennial Garden" system requires only moderate care and maintenance. During dry season additional irrigation may be necessary.

System Build-Up

  • 1: Plant layer according to plant list
  • 2: Growing Media “Zincoblend I”,
    depth: ca. 5 in. (ca. 125 mm)
  • 3: Filter Sheet SF
  • 4: Drainage Element Floradrain® FD 40-E
  • 5: Protection Mat SSM 45
  • 6: Root Barrier WSF 40 (optional)
System Build-Up
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6




Technical Data

Build-up height:
ca. 6 ¾ in.
Weight, saturated:
ca. 42 lbs/sq. ft.
Water storage capacity:
ca. 1.8 gal/sq. ft.

Standard Architectural Details:
Click to open pdf

Find more formats (.dxf, .dwg) in our download center.

Plant examples:
Click for a larger view