One of my favorite teas around, Yarrow & Rose make a beautiful combination in the jar and the meadow. Whenever I'm picking yarrow in a meadow it's often growing between big beautiful bushes of white and pink roses. This makes sense to me, as they're both faerie flowers and lend an astringent, toning quality to the entire body. More specifically, yarrow helps tone the digestive system and breaks down toxins in the blood so that they can be flushed out from the body without too many detoxification symptoms like headaches, rashes, or nausea. Roses tone the heart, circulatory system, and feed the capillaries beneath the skin: perhaps this is why drinking roses makes one's skin rosy?
I like to take a big handful of yarrow and a nice handful of roses and throw them into a quart jar. I boil water and fill it to the top and let them steep overnight. In the morning I drink 1-2 cups warmed up on the stove before eating anything to flush my body, tone my organs, and nourish my skin from the inside out!