Yarrow is easy to care for and versatile: they are good for borders, rock gardens, or wildflower meadows. These flowers are excellent for cutting or drying. Best planted in the spring in well-drained, average to poor soil. Yarrow thrives in hot, dry conditions; they will not tolerate wet soil. Divide yarrow plants every 3-5 years. Lift the clumps of flowers in early spring or fall and remove any dead stems from the center of the clump. You can replant the divisions in well-prepared soil.