Description :  

French Marigolds (Tagetes patula): French marigolds are small, bushy plants with flowers up to 2 inches across. Their blooms are described as single, anemone, or crested according to their appearance and occur in yellow, orange, or mahogany-red shades. Single types have one outer row of petals. Marigolds (Tagetes spp.) are among the most common and reliable of all bedding flowers. These cheerful flowers with warm colors and fern-like foliage are true annuals, completing their life cycles in a single growing season. The size and construction of the blooms can vary considerably, from tiny single-petal flowers of the signet marigolds to the large 4-inch double-petal blossoms of the African marigolds, but all show their membership in the aster family with flowers demonstrating the characteristic daisy-like appearance. Marigolds are typically planted from nursery starts or seeds planted in the spring after the soil can be worked. These fast-growing plants will achieve blooming maturity within a matter of a few months when planted from seeds. For earlier outdoor blooms, start the seeds indoors six to eight weeks before the last frost. Marigolds are very low-maintenance once established, and they are notably pest-free. In fact, they are sometimes planted as a deterrent to pests that attack other plants. Marigolds can bloom almost non-stop and will keep going all summer, until frost. To achieve that non-stop flowering, keep your marigolds deadheaded. Flowering may decrease slightly during the heat of summer but generally resumes in full force as cooler weather arrives. 

Note :  This image only use for illustration purpose.