Ageratum -

: The name comes from the Greek a (not) and geras (old age), because the flowers retain their color for a long time.

: Known for "fluffy" flowers, often in shades of true blue , purple, pink, or white. ageratum

Ageratums are popular for garden borders and containers because they are relatively low-maintenance. Ageratum houstonianum - Plant Finder : The name comes from the Greek a

: Usually grown as a compact annual bedding plant, reaching 6 to 30 inches in height. Gardening and Care often in shades of true blue