I recently got a house in Corona with a half acre backyard. Most of the backyard is not fenced in and backs up to a wash/large open area. This area is mostly covered in mustard, great brome grass, and other invasives. There are a few natives here and there that I can find. There's also a lot of trash that I've been slowly removing as full as I can get my trash bins.
I would like to plant natives here, but being in a large open space, I don't want to mess with local genetics. I've been gathering seeds and planting in pots for the last few years, but I was living in an apartment with a large patio and didn't need many seeds to fill it. Any tips on how to best get this area planted with natives and not causing other issues? Collect local seeds little by little? Buy local seed stock if I can find it?
Edit: I'm finding places with sources thanks to the helpful comments, how local should I be looking? Within my own block? City? Within an hour of me? Maybe I'm overthinking things 😅
Thanks!