A low, mat-forming member of the mustard family from the Mediterranean coast, grown almost everywhere as a cool-season annual for its dense mounds of tiny, sweetly fragrant white four-petaled flowers. The flowering is so profuse it often hides the gray-green foliage entirely. It thrives in cool weather, tolerates dry soil and drought, and is a reliable nectar source for small pollinators.

A tall, bold warm-season annual from Mexico and Guatemala (the "African" name is a misnomer of its European garden history) grown for large, fully double, pompon-like flowerheads in saturated yellow, gold, and orange over strongly aromatic, finely divided foliage. Plants reach 12-48 inches and bloom from early summer to frost in full sun. The petals are edible and used as a culinary garnish and natural dye, and the flowers are the iconic "flor de muerto" of Mexican Day of the Dead. Despite the wide listed zone range it is frost-tender and grown for a single warm season.

A fast, low-maintenance warm-weather annual from Mexico and the southern United States, grown for saucer-shaped, daisy-like flowers (2-4 inches across) with red, pink or white rays around a yellow center. The lacy, threadlike bipinnate foliage gives an airy texture, and the long bloom run from early summer to frost makes it a workhorse for cutting and cottage gardens. It flowers best in lean soil — overly rich, fertile ground produces leafy plants with fewer blooms.

A tender perennial from Madagascar grown across temperate North America as a heat-loving summer annual — a mounding 6-18 inch plant in the dogbane family covered in flat five-lobed phlox-like flowers from June to frost. The species blooms rosy-pink to red with a darker mauve throat, and it shrugs off the hot, humid weather that wilts most bedding plants. Every part of the plant is poisonous: it is the natural source of the vinca alkaloids used in chemotherapy.

The California state flower — a drought-tolerant southwestern native perennial (grown as annual outside zones 8-10) producing iconic vibrant orange (sometimes yellow, pink, red, or white in cultivars) cup-shaped flowers that open in sun and close at night or in cloudy weather. Naturalizes readily via self-seeding; among the most reliable hot-dry-site wildflowers for borders, meadow plantings, and rock gardens. Family Papaveraceae but unrelated to the opium poppy (different chemistry, no narcotic alkaloids).

A fast, sun-loving member of the aster family grown as a warm-season annual, Gaillardia pulchella throws a long succession of 2-inch daisy-like flowers from early summer until frost. The ray florets blaze in bands of red and gold around a darker domed center — the firecracker coloring that gives it its name — on a wiry, branching 12-24 inch clump. It is built for hot, dry, sunny ground where richer-fed bedding plants sulk, blooming hardest exactly when summer heat peaks.