Broccoli Microgreens Seeds. Broccoli microgreens have high sulforaphane content, are dark green and have mild broccoli flavor. The greens are fast growing and substantial. Easy to grow and grows well in both soil and hydroponic pads. Germination is fast, with seedlings first appearing in 1 to 2 days. Harvest between 8 and 12 days. Non-GMO.