Picked a few seeds off what is almost certainly an Austrian Winter Field
Pea the other day. It grew for months in the winter surrounded by pasture grasses and a knapweed plant and has set seeds now in July. Planted by a vole from plants that grew last year in my garden. A very common but extraordinary variety used heavily in cover crops. I highly recommend it. Seems to be a reliably volunteering pea in my garden and perhaps outside of my garden.
Western Montana gardener and botanist in zone 6a according to 2012 zone update.
Gardening on lakebed sediments with 7 inch silty clay loam topsoil, 7 inch clay accumulation layer underneath, have added sand in places.