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Updated: Apr 28, 2026

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Developing resilient green roofs in a dry climate.

M Razzaghmanesh1, S Beecham1, C J Brien2

  • 1Centre for Water Management and Reuse, School of Natural and Built Environments, University of South Australia, Adelaide, Australia.

The Science of the Total Environment
|June 2, 2014
PubMed
Summary
This summary is machine-generated.

Low-maintenance green roofs for dry climates can be achieved using specific growing media and plant species. Mild slopes and intensive systems with media type C, planted with Chrysocephalum apiculatum or Disphyma crassifolium, demonstrated optimal performance.

Keywords:
Green roofPlant growth indexResilient citiesStormwaterWater sensitive urban design

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Area of Science:

  • Environmental Science
  • Urban Planning
  • Horticulture

Background:

  • Living roofs are a green infrastructure technology with potential to mitigate climate change and urban heat island effects.
  • Limited research exists on designing green roofs specifically for arid climates.
  • This study addresses the need for low-maintenance, unfertilized green roof designs in dry environments.

Purpose of the Study:

  • To investigate the effects of slope, depth, growing media, and plant species on green roof performance in a dry climate.
  • To identify optimal design parameters for low-maintenance green roofs in arid conditions.
  • To evaluate plant growth responses and survival rates under dry climate conditions.

Main Methods:

  • A split-split-plot design was used to test sixteen medium-scale green roofs over one year.
  • Factors included slope (1° and 25°), growing media depth (100mm and 300mm), and different growing media and plant species.
  • Plant growth metrics such as root depth, biomass, ground cover, and water use efficiency were monitored.

Main Results:

  • Plant growth was significantly better in growing media types B and C compared to type A.
  • An average plant survival rate of 90% was achieved.
  • Mild slopes with intensive systems using media type C and specific plant species (Chrysocephalum apiculatum or Disphyma crassifolium) showed the best results.
  • Retained water in the drainage layer and stormwater were identified as viable water sources.

Conclusions:

  • Successful low-maintenance green roofs can be developed for dry climates.
  • Specific growing media and plant selections are crucial for arid environments.
  • Green roofs can effectively utilize stormwater and retained water, reducing irrigation needs.