I'm an urban rental dweller--West Portland--whose elderly landlords would rather deal with issues with the house rather than the yard, on which grass seed that I've bought does not grow; the soil is depleted and I can't really afford to pay for bag after bag of compost or fertilizer (it's a pretty big lot). So after a little research I read about the endangered Oregon Kincaid's Lupine and am wondering if that could be planted here for a few years to enrich the soil and grow harvestable seeds for others to grow. I doubt the landlords nor the neighbors would object, given that the yard is mostly moss and dandelions now. Any merit to the idea?
Kincaid's Lupine is a rare plant species in Oregon as you have found from your research. This species is associated with upland prairie and oak savanna habitats but can also be found on disturbed sites such as roadcuts and ditch banks. As of 2003, the species had been located on 48 different soil types. It often occurs on heavy soils with mesic to slightly xeric moisture regimes. If you can find seed and propagate this plant great! I don't know what your soil is like, but if you have seed, soil and opportunity, I would try it. Good Luck!