Species selection

To ensure the success of green infrastructure within new development throughout its expected life span, it is essential that the correct species is chosen for each site. It is important that the potential mature size of any planting is known to ensure there is enough space and that the planting is not likely to spread onto other development features (for example, roads, accesses and houses). Other important factors are characteristics such as the shape, growth habit and ornamental qualities of a tree species. 

A professional landscape architect and arboricultural support should advise on species selection. This will ensure that new planting is suitable for the soil conditions and location.

The Value of Trees toolkit

The Value of Trees toolkit, and in particular the "Tree Matrix”, can assist with the selection of the appropriate tree species for the site. The tool can help to the narrow down the range of suitable species by inputting requirements regarding aesthetic aims and tolerances. The Matrix can also assist with achieving site specific ecosystem service objectives, such as reducing flooding or carbon sequestration, through the planting of trees and hedgerows.

Biodiversity

New planting can create opportunities to enhance sites for biodiversity through species choice. Generally, in rural areas, native plant species should be used to help blend the new development into the surrounding landscape and reflect the local character of the area. However, the impacts of pests and disease and climate change must be considered as part of the design process, for example currently ash (fraxinus excelsior) would not be accepted within adopted highway due to the prevalence of Ash Dieback (see Ash Dieback Action Plan for further information).

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