Answer: You can divide your yarrow when it has finished blooming. If you transplant it now, you may lose blooms for the remainder of the season. Transplanting now won't hurt the plant, especially if you give it a little extra attention until it gets established in its new home, but you may lose flowers until next spring. Yarrow is a hardy plant that can take all kinds of abuse, but you can help it make the transition by transplanting in the late afternoon so it has a chance to settle down before it has to face the summer sunshine.
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