The researchers studied how inbreeding affects the health of plants in the Mimulus species. They found that when plants have more inbreeding, they tend to be less healthy. This was especially true for traits like height. However, the level of genetic variability in the plants did not seem to affect their health. Surprisingly, plants with similar levels of inbreeding could have very different health outcomes. This suggests that factors other than genetics play a role in plant health. Overall, the results support the idea that inbreeding can make plants less healthy, but other factors also play a part.