Mills Seed Starter Kit The Seed Starter Kit has everything a home grower will need to get off to the best possible start when growing plants. All in one germination kit. The Seed Starter Kit has everything a home grower will need to get off to the best possible start when growing plants. Easy-to-use. This easy-to-use seed germination kit lets your customers sprout the seeds they bought at home easily, and we believe they will love it. Germination in 72 Hours. Using the Mills Seed Starter Kit, seedlings should germinate after about 72 hours.