Is Ageratum Annual Or Perennial. One species that is commonly used as a bedding plant Ageratum houstonianum is from Mexico and is named after William Houston 1695-1733 a Scottish physician who collected the first ageratum. Description of hardy ageratum.
The Ageratum is half-hardy. Description of hardy ageratum. From late spring to frost.
They have toothed ovate leaves arranged oppositely along the stem.
Lasseauxi is properly a species of Eupatorium. The Ageratum is half-hardy. The leaves are oval-shaped rough dull green. It is a Native plant of Mexico.