Thank you for your lovely reply. I'll try and answer as best as I can.
I stumble across most seed's while doing other things in the forest such as tramping or pest trapping. While the Kowhai seeds I grab from a beautiful old naturally bonsaid tree on an island I do conservation on.
The idea of eco-sourcing is that plants of the same species have regional variation which makes them better suited/more benificial for that region. So we want to plant planted with seed that came from a wild plant in the ecological region they are planted in. (Another benifit of wild plants is more genetic diversity).
The nursery is purely for conservation and is partnered with our department of conservation they sell plants at a price low enouph to buy the stuff to grow more plants and everyone there is a volenteer growing plants for fun (mostly lovely old people).
Also how does a seed library work? is it where people bring there excess grown seeds to share with others, because if so that's so cool, I wish we had a thing like that here