Sunflower (Helianthus) Three- to 14-inch, daisy-like blossoms on plants 2 to 10 feet. Yellow, orange, mahogany, bicolors. Varieties: Teddy Bear, Sungold, Mammoth, Red. Soil and Light Tolerant of all soil types kept moist. Full sun. Planting Sow seed outdoors after frost danger passes. Comments Use tall varieties as temporary screens. Try smaller varieties in beds. Grow large varieties for tasty seeds.