Microgreens are water hoggers, so it is essential to ensure that your microgreens have appropriate amounts of water throughout the day. Although there are no concrete numbers as to how much you should water your microgreens, it is a good rule of thumb to water them once or twice a day. However, for a more contextual approach, you should check if the soil used for your microgreens is dry; if in the instance that it is, you should water it.