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.
Historical Examples

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

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

I should think a low-growing plant like ageratum would be pretty in a vase of that sort.
Ethel Morton’s Enterprise Mabell S.C. Smith

“We’ve decided on ageratum for the border and larkspur and monkshood for the back,” said Ethel Brown.
Ethel Morton’s Enterprise Mabell S.C. Smith

ageratum, with its delicate lavender-blue flowers, can be made extremely attractive in combination with yellow Coleus.
Amateur Gardencraft Eben E. Rexford

ageratum is lovely for edging beds of pink Geraniums, its soft lavender tones being in perfect harmony with their color.
Amateur Gardencraft Eben E. Rexford

This was money enough to buy seeds of ageratum, zinnia, dwarf nasturtium, California poppy and verbena besides some others.
The Library of Work and Play: Gardening and Farming. Ellen Eddy Shaw

The ageratum is a lovely plant for a low bed, with its great masses of soft lavender flowers.
Amateur Gardencraft Eben E. Rexford

any tropical American plant of the genus Ageratum, such as A. houstonianum and A. conyzoides, which have thick clusters of purplish-blue flowers


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