Blue flowers are rather rare among annuals.
The flowers are dainty and feathery, often delightfully fragrant, and usually completely cover the plants. There are attractive dwarf, tufted plants as well as tall, upright growers. The dwarfer sorts appear to produce much more bloom, although the tall sorts furnish longer-stemmed cut flowers. The blue of the Ageratum combines well with pink in the garden. The white varieties are not as attractive as many of the other white annuals.