Cosmos bipinnatus, commonly called the garden cosmos or Mexican aster, is a medium sized flowering herbaceous plant native to Mexico. The species and its varieties and cultivars are popular as an ornamental plant in temperate climate gardens. It can also be found in natural areas in much of North America, where it is a "garden escapee"-introduced species and in some habitats becoming a pest weed. Wikipedia
In my school gardens: Laurel Nokomis School
This plant is a weed in our gardens, though it is a pretty one.