The diagram is posted for review here.
|Green Roof Plant Root Architecture Comparison - MetroVerde|
|Root Architecture - Poor Green Roof Formation|
|Green Roof Plant - Root Architecture 1 - MetroVerde|
|Green Roof Plant - Root Architecture 2 - MetroVerde|
|Green Roof Plant - Root Architecture 3 - MetroVerde|
|Green Roof Plant - Root Architecture 4 - MetroVerde|
When I removed the mat section I cut out about twice the diameter of the plant crown or habit (form diameter) thinking I'd capture all the root mass. Upon further examination the plant had extended its roots over triple the area I'd cut.
Note how the roots have grown and woven themselves into the mat - providing an anchor against high winds and allowing for use vertically.
The root architecture of plants grown in mats exemplifies the benefits of growing green roof plants in mats. Roots do not like to be bound up with limiting walls. It you do not use mats, then use large tray systems.
With time, green roof plants with access to a large, monolithic and non-sectioned growing space will eventually 'move' to the best spot for their particular needs - on the roof.
The same basic principle applies to living walls. A monolithic fabric with no limiting sectional structure will allow the plant to choose the best spot for successful, long tern growth.