Basic requirement is bright sun and loose soil.
Today, they range in color from clear yellow to golden yellow, orange to burnt orange and many variations in between. Marigolds thrive with sun Marigolds require full sun and grow best in a loose garden soil with plenty of organic matter or humus. Even though you may see them growing in the worst soil possible, results are never as good as they could be. Easily started from seed Marigold plants are more often purchased as young transplants in peat pots or trays or packs. They can be easily started from seed, however, if you save seed from last year's plants they will not be true to the variety since most marigolds are hybrids.