Marigold Seeds,
Sweet Mace

Sweet Mace is well-suited to USDA zones 8-11, where it grows as a perennial. In these zones, it may die back in winter but will regrow in the spring. In cooler climates, it is typically grown as an annual due to its sensitivity to frost. It’s important to plant it outdoors only after the last frost has passed. If starting seeds indoors, this should be done 3-4 weeks before the last expected frost date, ensuring the seedlings are ready for transplanting once outdoor conditions are favorable​. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

For direct sowing, seeds should be planted outdoors after the threat of frost has passed. Lightly press the seeds into the soil without covering them too deeply and keep the soil consistently moist until germination. If starting indoors, sow them in a seed-starting medium and keep them moist. The seedlings should be transplanted outdoors when they are 2-4 inches tall and have been properly hardened off to acclimate to outdoor conditions.

Sweet Mace doesn’t require too much care once established. Regularly pinching back the growing tips can help encourage a bushier growth habit, and deadheading spent flowers will prolong the blooming period, which typically occurs in late summer to early fall. While the plant is generally trouble-free, it can be susceptible to pests such as slugs and snails, especially in the seedling stage, and fungal issues like botrytis may occur if the plant is kept too moist. Ensuring good air circulation and avoiding overwatering are key to preventing these problems.

Seeds are mature once the flower heads have fully dried and turned brown. To harvest them, cut the flower spikes and place them inside a paper bag. This allows the seeds to completely dry and drop; you may need to shake the bag gently to help loosen the seeds. Afterward, separate any chaff from the seeds and store them in a cool, dry place.

Many people prefer propagating plants through cuttings as it is generally easier than growing from seeds. Simply take a cutting from a healthy plant, remove the lower leaves, and place it in water until roots develop. Then, plant it in the soil.