Marjoram, a tender perennial herb, is slow-growing from seed, so it is best to start with cuttings or plants. Plant them in full sun with well-drained soil about 12 inches apart.
Marjoram prefers slightly dry conditions, and once established, it does not require much care. Water the plants during dry spells by soaking, as opposed to spraying, so the roots grow deeply. If grown outdoors in good soil, marjoram does not need fertilizer. As the plants grow, cut off flower buds before they bloom to encourage the plant to continue growing. Begin harvesting leaves after four to six weeks.
Before freezing temperatures arrive, transplant marjoram into containers to over-winter indoors near a sunny, south-facing window.