Hmmm....
Where are you gardening at "Pyewacket"?
Centrosema seems to already grow pretty much anywhere that hasn't been poisoned or planted in turf in my area... Sadly, some people seem to unimpressed because it's already growing at their house... and pull it as a "weed".
Not sure whether I've collected seed recently enough to still be viable... will check when I get home... if I remember...
It's very slow to bloom from seed or transplant....