Because these chemicals can be toxic to man and animals, you should take proper precautions and follow directions on the label. Finally, to help you select plants for your garden, brief descriptions of some well-known perennials are provided in the following paragraphs. The list represents only a small fraction of the perennials that do well in most areas of the United States. Yarrows grow 6 to 24 inches high, and have white, pink, or golden flowers frequently combined with silvery foliage. Dwarf types can be used for rock gardens.
Yarrows are also good for cut flowers.
Achilleas will grow in most soils. Propagation is by seed or division of clumps. Seed germinates in 7 to 14 days. They prefer sunny areas but will tolerate some shade, Propagation is by seed planted any time from spring to September. Germination is irregular.