Calendula (common name: pot marigold) is a genus of plants that belong to the family Asteraceae. There are about 20 species of plants that come under the genus Calendula. Calendula is herbaceous, in the sense that the leaves and the stem above the level of the soil die at the end of the growing season.
Some species of calendula die in one year (annual). Some other species live more than two years (perennial). The genus is native to the region stretching eastward from Macaronesia (a group of islands in the North Atlantic around the Europe-North Africa region) to Iran, with the whole Mediterranean region in between.
Its common name marigold is likely to owe its origin to the Virgin Mary. Gardening connoisseurs consider the marigold to be one of the best flowers that can be grown in a garden because they are rugged and not at all finicky about where they grow. However, the ideal location for their growth is a sunny place with a soil rich in substances favorable to plant growth and that is well-drained.