Regions of Provenance
Great Britain is divided into four regions of provenance. These are defined areas within which similar ecological and climatic characteristics are found. They provide a framework for specifying sources of Forest Reproductive Material (FRM).
Regions of Provenance Map (429k - pdf)
Native Seed Zones
For native species, the regions of provenance have been split into a total of 24 non-statutory native seed zones. Seed zones are in turn divided where appropriate into two altitude zones, below 300 m and above 300 m.
There is a different set of seed zones for native Scots Pine.
If the species is native to GB (native seed zones only) a ‘h’ in the code means an altitude greater than 300 m.