The quick and convenient guide to growing your very own Spearmint! Growing Spearmint From Seeds Spearmint is a versatile plant that may be grown from seed indoors and transplanted outside after frost, or planted as a potted plant directly outside. Order Your Sacred Plant Co Spearmint Seeds Growing Your Spearmint Seeds From Seed In 5 Simple Steps # 1 | Sow mint seeds indoors 8-10 weeks before the last frost in spring using a seed starting kit. Sow seeds 1/8 inch deep in a good