Yarrow
Easy to grow, outstanding perennial companion plant. Ancient healing herb, used worldwide to stop bleeding, heal wounds, break fevers, and for headaches, colds, and flu. A handful of leaves in the bath soaks out aches and pains. Excellent butterfly and beneficial insect plant, with big flat clusters of small flowers—the shape butterflies prefer for landing and nectar-gathering. Forms a mat of roots and lacy leaves that hold soil and allow moisture to penetrate; good for sloped beds and edges of perennial plantings. This quality, along with its soft, non-woody texture, makes it an excellent choice for an herbal lawn. Mowing will keep it low, cause it to spread more densely, and prevent it from flowering. Unmowed, it will send up stiff flower stalks to 2 ft. One of the best anti-erosion plants. Recommended for orchards, where it can hold the soil while drawing beneficial insects. Achillea millefolium