Ageratums are popular for garden borders and containers because they are relatively low-maintenance. Ageratum houstonianum - Plant Finder
: Usually grown as a compact annual bedding plant, reaching 6 to 30 inches in height. Gardening and Care ageratum
: The name comes from the Greek a (not) and geras (old age), because the flowers retain their color for a long time. Ageratums are popular for garden borders and containers