Annual Bluegrass Scientific Name: Poa annua

This plant is often sold as a species of turf grass—and sometimes isn't considered a lawn weed. Due to the fact that it's able to adapt to different climates and growing conditions, Poa annua can be found in a wide range of habitats throughout much of North America. These grassy weeds are annuals, meaning they live for only one season and are typically easy to control because they lack the complex underground structures needed to spread new plant growth through creeping roots. Still, annuals produce tons of seeds that can infest and dominate your yard under the right conditions if you aren’t careful with control and treatment procedures.