Foxtails are grass-type weeds that have bushy flower heads, which fascinate birds and children. The broad leafy blades of these weeds stand out among the turf and finer grasses long before their flowering plume appear. They only live for a year, but high seed production may make them come back. Many species of foxtails shed their seeds in the fall and germinate in the spring. However, some seeds germinate once they hit the ground. In sunny, the foxtail outweighs the number of weaker plants. For instance, a foxtail plant may yield thousands of seeds in one summer.