Greener Gardener

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Green Roof

 

Green Roof : Types & Advantages

 

Green roofs are usually categorised into three groups: intensive, semi-intensive and extensive.

 


 

Intensive

These are essentially roof gardens, which may include trees and shrubs, as well as herbaceous perennials and other less deeply-rooted plants.


Vital Earth recommend:

  • For installation: Meadow Roof Medium and Meadow Roof Lite (200mm or more)

  • For plant raising: Meadow Seed Medium and Green Prop Medium


 

Semi Intensive

Here the roof medium is shallower and the range of plants is therefore limited to less deeply-rooted subjects. However, the range can still be quite diverse and include dwarf shrubs, as well as bulbs, grasses and other perennials: largely derived from alpine, prairie and coastal ecosystems.


Vital Earth recommend:

  • For installation: Meadow Roof Medium and Meadow Roof Lite (150mm)

  • For plant raising: Meadow Seed Medium and Green Prop Medium


 

Extensive

Choice of plant subjects is limited by the shallowness of the green roof medium, which may be determined by the modest load-bearing capacity of the roof (notably, retro-fitted green roofs).  Extensive green roofs may also be preferred where access to the green roof for maintenance is constrained, or budget is limited. Subjects include Sedum, Sempervivum, grasses and drought-tolerant herbs. Sedum is very dominant and it is frequently installed as Sedum mat (over 50-75mm of medium) for rapid installation and immediate impact.

 

Vital Earth recommend:

  • For installation: Sedum Roof Medium and Sedum Roof Lite (50-100)

  • For plant raising: Sedum Seed Medium for Sedum Mat, Green Prop Medium for modular trays and other containers

Green Roof


 

Advice

Specialist advice is available, based on extensive knowledge of growing media and plant nutrition.

 

 

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