A big part of evolution is competition— when there are limited resources to go around, plants and animals have to duke it out for nutrients, mates, and places to live. That means that the flower-covered meadows of China's Hengduan mountains were an evolutionary mystery— there are dozens of species of closely-related rhododendrons that all live in harmony. To figure out why, scientists spent a summer carefully documenting the flowering patterns of 34 Rhododendron species, and they discovered the reason why the plants were able to coexist: they burst into bloom at different points in the season so they don't have to compete for pollinators.
source https://www.lifetechnology.com/blogs/life-technology-science-news/different-blossoming-schedules-have-kept-these-flowers-from-driving-each-other-extinct