Fertilizing Microgreens!
We suggest using either Azomite, a trace mineral fertilizer, or a water-soluble fertilizer such as, FloraGro. Both provide essential nutrients to your seedlings—and in this case, your microgreens—but they are applied using different methods.
Azomite:
A fine powder mined from a volcanic ash deposit that contains a myriad of rare earth elements and trace minerals. We recommend mixing it in with your compost and incorporating that compost into your potting soil for microgreen growing, or just mix it directly into the potting soil. Mixing it in before-hand allows the Azomite to process and break down to be better consumed by your microgreen plants.
A water-soluble fertilizer containing a well-balanced amount of nutrients for structural and foliar growth. Wait until your microgreens are poking out of the soil and the cotyledon leaves are spreading apart and reaching for the light, and then fill a cap-full of fertilizer and mix it in a gallon of your watering water.