Six to Eight Weeks

• Violas begin to flower in 7 weeks.Jupiterimages/Comstock/Getty Images
  
  French marigold (Tagetes patula) reaches a mature height of 6 to 12 inches. It typically flowers six weeks from the time the seed germinates. Grow French marigold in full sun in either containers or as an edging for flower beds. The average mature height of violas is under 6 inches. They bloom in six to eight weeks. Grow them in full sun, part shade or full shade.
  
  

Eight to Ten Weeks

• Zinnias add a rainbow of color to the garden.Medioimages/Photodisc/Photodisc/Getty Images
  
  Alyssum, sunflower, stock (Matthiola), nasturtium, nicotiana, thunbergia and zinnia bloom eight or nine weeks after germination occurs. Sow alyssum, stock, nicotiana and thunbergia indoors 6 to 8 weeks before you intend to transplant them into the garden. Sunflowers, nasturtium and zinna are easy to direct-sow in the garden once all danger of frost is past. There are many different varieties of these plants. They all prefer growing in full sun, but mature height will vary greatly depending on the cultivar.
  
  

Ten to Eleven Weeks

• Impatiens create a riot of color in the shade garden.Jupiterimages/Photos.com/Getty Images
  
  Ageratum, cosmos, cigar plant (Cuphea), strawflower (Helichrysum), impatiens, marigold, pansy, phlox, poppy, annual salvia and verbena bloom 10 to 11 weeks after their seeds germinate. For the fastest blooms in the garden, sow these seeds indoors eight to 10 weeks before the last frost in your area. Poppies do not like being transplanted, so sow them in peat pots or directly in the garden in early April. Do not cover impatiens or poppy seeds, because they need light to germinate.
  
  

Twelve to Fourteen Weeks

• Celosia flower 12 weeks after the seed germinates.Jupiterimages/Photos.com/Getty Images
  
  Agastache, English daisy (Bellis), Celosia, coreopsis, Gazania, candytuft (Iberis), lobelia, petunia and snapdragon bloom 12 to 14 weeks after germination occurs. The ideal time to sow these seeds indoors is 10 to 12 weeks before the last frost in your area. Gradually move them outdoors for brief periods of time, extending the time daily, until they are used to the weather conditions in your area. Once they are hardened off, go ahead and transplant them into the garden.