Chocolate mint actually does smell like chocolate. It is a variation of regular mint with just a few small differences. The stems of chocolate mint have brown in them and the leaves are a little rounder. It grows the same as regular mint which means it is also very invasive. Growing it in a container helps to keep it under control.
It loves moist, soggy soil. I have to water mine daily in the heat of the summer. I combine rich, composted soil with Miracle Gro potting soil at a 50:50 ratio. It will thrive in full sun or partial shade. Make sure to cut it back several times during the season. It will grow back more lush each time.
The aroma is stronger than regular mint and very pleasant. Personally, I think it is a very pretty herb. Last year was my first year with chocolate mint. I have dried some and as with regular mint, the scent is even stronger when dried. It also has oil that stays on the dried leaves. I consider it a welcome addition to my herb garden.