Seeding annual plants for rare plant restoration and reintroduction

I have a project dealing with annual plants on the Channel Islands. We hope to bulk up some existing populations, but also create new patches. Has anyone had success with seeding rare annuals in Mediterranean systems? I'm worried about seeds staying in place, being predated, and getting sufficient rain for germination. Given that these are diminiutive annual plants and the biosecurity challenges of working on islands, growing and outplatning seedlings is not practical. We will be bulking seed in the greenhouse to try to maximize our propagule output, but it will be difficult given the small seed collections that we're starting with. Any tips, pitfalls or insights would be helpful!

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