Bachelor’s button will come back every year with little to no help. They are known for prolific self-seeding (they were originally considered a weed, after all), which makes these annual flowers a low-maintenance addition to your landscape. Because of their high seeding rates and hardy nature, they will quickly spread if allowed to go to seed and can become a nuisance. If you want to prevent cornflowers from taking over your garden, make sure to prune the blooms before they go to seed.