noun. Any of various tropical American plants of the genus Ageratum in the composite family, especially A. houstonianum, cultivated for their fluffy blue, purple, pink, or white flower heads.

noun. Any of several other plants having flower clusters similar to those of ageratum.

noun. A genus of plants, natural order Compositæ, all American and chiefly tropical, nearly allied to Eupatorium.

proper noun. A genus of plants, one species of which (Ageratum Mexicanum) has lavender-blue flowers in dense clusters.

noun. Any of the genus Ageratum of tropical American herbs, annuals and perennials, from the sunflower family Asteraceae, tribe Eupatorieae; they are sometimes used in floral displays.

noun. rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium

noun. any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers

"Some seeds, such as ageratum, alyssum, impatiens, petunias, and snapdragons, should not be covered at all because they need light in order to germinate."

flower  

Alyssum  Lycopodium  Nasturtium  balsams  beechwood