The rhizome of Acorus gramineus is about 2-5 mm thick and has a faint fragrance. Its color is light brown, its rhizome is fleshy and there are many fibrous roots on it. The length of internodes is usually 3-5 mm.

The rhizome of Acorus calamus is horizontal, with a thickness of about 5- 10mm, and it is fragrant, but yellowish brown. Its fleshy roots are about 5-6cm, and its fibrous roots are hairy.

2. The difference between leaves

The leaves of Acorus gramineus are thin and linear, about 20-30cm long, sometimes up to 50cm. Its leaves are dark green and have no ribs.

Acorus calamus leaves are sword-shaped and long, about 90- 150cm. Its leaves are green, very bright and have obvious ribs.

3. Habit differences

Acorus gramineus likes to grow in a semi-shady environment, afraid of direct sunlight, and likes a humid environment.

Acorus calamus also likes to grow in wet places. It likes warmth, and the warmth of the environment should be around 20-25℃.