- any of several composite plants of the genus Ageratum, especially A. houstonianum, having heart-shaped leaves and small, dense, blue, lavender, or white flower heads, often grown in gardens.
- any of various other composite plants, as the mistflower, having blue or white flowers.
Origin of ageratum
Examples from the Web for ageratum
Historical Examples of ageratum
The soft blue tufts of the ageratum were on each side continually.Bonaventure
George Washington Cable
Ageratum, candytuft and dwarf nasturtiums are good for the purpose.The Library of Work and Play: Gardening and Farming.
Ellen Eddy Shaw
It is easily grown, and makes a fine second-row plant for a border, contrasting well with Browallia or Ageratum.The Practical Garden-Book
C. E. Hunn
"We've decided on ageratum for the border and larkspur and monkshood for the back," said Ethel Brown.
I should think a low-growing plant like ageratum would be pretty in a vase of that sort.
- any tropical American plant of the genus Ageratum, such as A. houstonianum and A. conyzoides, which have thick clusters of purplish-blue flowers