Microgreens are a type of small and edible leafy vegetable. They are typically harvested when they are about two to three inches in height.
An article shared by New York University states that the process takes about 8-10 weeks and there are many factors involved in its success or failure. This is why it is better to harvest the microgreens before they have grown too much to ensure a successful harvest.
Microgreens should regrow after cutting, because they have the ability to heal and regenerate. However, this will depend on the type of microgreen you harvest them from.