| Name | Ageratum houstonim / Ageratum houstonianum |  |
| Family | Asteraceae | |
| Species | - | |
| Ageratum houstonianum (Flossflower, Bluemink, Garden Ageratum, Blueweed, Pussy Foot) syn. Ageratum mexicanum Hort.) is a cool-season annual plant often grown as a bedding plant in gardens. Herb 0.3-1 m high, leaves ovate to triangular 2-7 cm long, and flowers are usually blue (though sometimes white, pink, or purple), the heads borne in dense corymbs. The ray flowers are threadlike, leading to the common name. Native to Central America and adjacent parts of Mexico, but has become an invasive weed in other areas. Ageratum has evolved an ingenious method of protecting itself from insects; it produces a precocene compound which interferes with the normal function of the corpus allatum, the organ responsible for secreting juvenile hormone. This chemical triggers the next molting cycle to prematurely develop adult structures, and can render most insects sterile if ingested in large enough quantities. | ||
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