Tim Watts wrote:

On an aside, regarding the nitrogen fixing abilities - does that benefit
the soil if the plant is allowed to live?

IIRC, yes; some of the nitrogen fixing nodules break down to the benefit of
the neighbors. This is one reason clover used to be used in lawn mixes. I
recall reading that clover became flora non grata when companies came up
with weed killers that didn't hurt grass but did kill the clover.
"Kills dandelions, other noxious weeds, and that nasty old clover."


--
Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic
Zone 5/4 in upstate New York, 1420' elevation. NY WO G