These are some of the most popular annual flowers on earth. The marigold group called "Crackerjack Mix" has decorated millions of gardens for decades. These are the big ones--bright ball-shaped flowers in yellow and orange or sturdy plants 2-3 ft. tall. The flowers are chrysanthemum-like with a mass of bright colored petals. And best of all, they keep blooming all summer long. Add these to your meadow, and the color will never stop.