Micro herbs are also known as microgreens. The easiest one to grow is radish, and in fact, it is said, try not making it grow! They can be harvested as soon as 5 days after planting. The next easiest micro herb to grow is broccoli. Although slower than the radish, they are more consistent, and they have lovely rounded clovers like leaves. The 3rd best micro herb to grow is the cabbage. The Red Acre is by far the most popular because of its gorgeous purple stems. They take about 14 days to grow. Still a very easy growing process!