No annual is more cheerful or easier to grow than marigolds.
Soil: Marigolds need lots of sunshine.Though they grow in almost any soil, marigolds thrive in moderately fertile, well-drained soil.
Sowing: Sow them directly into the garden once the soil is warm, or start seeds indoors about a month to 6 weeks before the last spring-frost date. Separate seedlings when they are about 2 inches tall. Space tall marigolds 2 to 3 feet apart; lower-growing ones about a foot apart.