Up to 12 days. Tatsoi Microgreens seeds. Very easy to grow with a great mild flavor. The mild flavor makes it a great choice as a base for any microgreen salad. It is said that tatsoi enhances the flavor of other greens it is mixed with. Tatsoi is a japanese spinach that is easy and fast to grow. Expose to light after 4 days, and experiment with flipping the lid on day 4 to strenghten the crop. Tatsoi is a green micro that has a pleasant mild flavor that makes a great choice as a base microgreen.