Ageratum is an annual herb with a height of 50 to 100 cm, but a few plants will be less than 10 cm, without obvious main root and thick stem.
Agastache rugosa is a perennial herb with erect stems, 50 to 150 cm in height, extremely short hairs on the upper part and no hairs on the lower part.
The leaves of Ageratum are opposite. The upper part may have alternate leaves. The shape of the leaves is oval or oblong.
The leaves are about 4.5 to 11 cm in length and 3 to 6.5 cm in width.
The flowers of Ageratum are usually closely arranged, few of them have loose corymbs, and the pedicels grow about 0.5 to 1.5 cm.
The inflorescence of Agastache rugosa is a cylindrical spike, the length is about 2.5 to 12 cm, the pedicel is very short, generally about 3 mm.
