Winners and losers are determined during the competition for resources among at least organisms. The most simplest way of declaring the winners and losers among our plants is when one plant stays alive and when another plant dies. Most of the time, it isn't easy to declare the "real" winner or loser. There could sometimes be multiple winners at one time or multiple losers. It could be hard determining the result because several factors may have contributed to the result. You won't realize the cause of the result without a more in-depth observation.

Our plants could have other relationships in the ecosystem besides competition with fellow plants. Organisms like insects (which are parasites) could chew on the leaves, which won't benefit the plant. The plant would eventually repair itself. Other organisms like weeds (commensalism) could also absorb part of the bean plant's diet. The bean plant wouldn't be benefited nor harmed.
As more interactions occur, organisms will start to have more relationships with the other organisms in the community. The organisms will start depositing nutrients into the ground. Simple plants such as weeds will start popping up and growing. Over time, they will eventually be more common around.