Seed transfer zones are mapped areas used to guide where plant materials can be moved for restoration. The basic idea is simple: seed collected from one place is more likely to perform well in another place when the two locations share similar environmental conditions and evolutionary histories.
Zones can be based on climate, soils, geography, genetic data, common garden experiments, or a combination of evidence. Some zones are provisional and broad, while others are species-specific and supported by field or genomic data.
What they help with
- Choosing seed sources for a restoration site.
- Avoiding movement of plant materials across strong environmental or genetic breaks.
- Communicating seed sourcing guidance in a map-based format.
- Supporting procurement, planning, and restoration documentation.
Where caution is needed
Seed transfer zones are useful decision aids, but they are not guarantees. They may not capture important species-specific biology, unusual soil conditions, climate change, hybridization, or local genetic structure. A zone that works well for one species may not work well for another.
For complex projects, seed transfer zones should be used alongside local knowledge, genetic evidence where available, restoration goals, and practical constraints such as seed availability.