Spiritual Herbs

In the Mi Luo continent, spiritual herbs are graded by years. For example, the growth period for a first grade spiritual herb is 10 years, for a second grade spiritual herb it’s 100 years, for a third grade spiritual herb it’s 1000 years, for a fourth grade spiritual herb it’s 5000 years, and for a fifth grade spiritual herb it’s 10 000 years. It’s very difficult to find spiritual herbs that are fifth grade and higher, and it’s not so easy to distinguish how old they are.