This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
This is a fine hardy plant about 4 ft. high, with dense feathery masses of white Ageratum-like flowers in August and September. It grows freely in any soil, and may be increased by division or seeds.
The following species are best grown in a greenhouse, and may be propagated from cuttings inserted in sandy soil in spring: atrorubens, reddish purple; probum, white; riparium, white, red stems; trapezoideum (or adenophorum), white, tall-growing.
 
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