Definition of "ageratum" []

• Any of various New World plants of the genus Ageratum in the composite family, especially A. houstonianum, having showy, colorful flower heads. (noun)
• Any of several other plants having flower clusters similar to the ageratum. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Some seeds, such as ageratum, alyssum, impatiens, petunias, and snapdragons, should not be covered at all because they need light in order to germinate."
• "A Fight for Flower Power Andy McMillan for The Wall Street Journal Dahlinova Dahlias at Metrolina Greenhouses in Huntersville, N.C. More photos and interactive graphics This year, Home Depot is touting an exclusive "Stellar Blue" ageratum, or floss flower, that hides faded blooms as it grows, requiring less clipping."
• "She is surrounded by the native wild ageratum, Conoclinium coelestinum inherited with the property and planted with bronze carex self sown seedlings."