Microgreens Seeds- Scarlet Nantes Carrot If you have never eaten carrot microgreens you should give them a try. They add a nice zesty taste, and loads of vitamins. They can also be grown as "micro carrots" in 20-30 days. 90% Germination. These greens should be harvested when the plants are 10 to 14 days old. They can be grown in moist paper towels (bleach-free) or in a soil mix.