- Marigolds grow naturally in warm environments, thriving in bright, full sun locations of the garden. Despite the inference of their common name, both the African marigold (Tagetes erecta) and the French marigold (Tagetes patula) are native to Mexico and Central America. Marigolds have naturalized in warm climates across the globe. They may be grown as perennials in USDA zones 9 to 11, and as annuals elsewhere.
- Marigolds are tolerant of a wide range of soil types, thriving in most soils so long as they are well draining. They look their best, however, grown in a well-drained soil enhanced with organic matter such as pine bark or leaf mold. When planting, space French marigolds about 6 to 9 inches apart and African marigolds up to 18 inches apart. Marigolds may benefit plants near them, as the roots of French marigolds can prevent harmful root-knot nematodes.
- Marigolds require regular gardening watering. Water deeply at least once a week for newly established plants, and water during extreme summer heat. French marigolds have a better tolerance of wet, rainy weather than African marigolds, although no marigolds like to be left standing in waterlogged, soggy soil. Fungal stem and root rot may be problems for plants in overly wet conditions or poorly draining soil.
- Marigolds require little maintenance, although deadheading spent flowers helps to prolong the flowering period and keep the plant looking tidy and healthy. Check occasionally for spider mites, which can attack plants in hot, dry weather. Marigolds are easily propagated. The seeds may be sown directly in the garden where they are to be grown, or they may be sown indoors and transplanted outdoors in the spring. Move seedlings about a foot apart once they grow to be an inch or two high.
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