I planted a mixed Plot of Corn and some variety of Kidney Beans (Maybe a quarter acre). The Beans climbed the Corn stocks and it turned into a nice thicket. It got really thick and was actually real pretty when the Beans flowered.
Dear really liked it and visited it all the way through summer and into the winter. The Corn and Beans that fell to the ground kept them coming back until almost spring.
This last spring I planted Beans again and not a one germinated and/or grew. Don't really know if it was too wet for them (we had a really wet spring and early summer) or I got a bad batch of seed?
I'd research it and pick my spot with care. In my experience most Beans don't like wet roots. They need a gentle hillside, sandy well draining soil or someplace where the roots don't stay wet all the time. Cycles of water and rest, so the roots can dry out some.
Just my experience with beans in general, Lablab may be different.