Yarrows are among the best plants for dry sunny locations. Some pre-site planning is needed due to their tendency to spread, so don't be afraid to trim them back 1/3 before they reach 18 inches tall. This will produce shorter stockier plants that are self-supporting early in the season, along with a more numerous amount of flowers. Leave basal foliage over the winter and cut out the dead foliage in the spring. After a few years the center often dies out and will look like a donut hole. When this happens dig out and discard the center and fill the hole with fresh soil.
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