Yarrow, or Achillea millefolium is an odd little plant found almost everywhere in the world. I recently purchased a decent sized one a few weeks ago at Flower World because of the useful things I have heard it can provide. Yarrow is similar to Angel hair ferns, because of their erect stature, and technically each frond of the plant is a plant on its own with its own roots, meaning propagation really doesn’t get any easier with plants like these. Anyways, yarrow has been cultivated all over the world for a very long time, its usage was recorded by many Native American tribes, and by other civilizations. It is generally only used as a medicinal plant, for it is a powerful diaphoretic, astringent, tonic, and a stimulant, among other things. History mainly describes it as a useful ingredient for treating flesh wounds, for it encourages the body to direct blood flow away from cuts and injuries. But other than being a widely used medicine and food, yarrow also makes a wonderful companion plant for a garden. Like comfrey, yarrow roots very deep, pulling up rich nutrients for its neighboring plants. But also, yarrow deters certain insect pests, while also attracting predatory wasps and other beneficial insects that prey on other pests instead of the plants. They also attract lady bugs and hoverflies, which pollinate plants instead of eating them. This plant is also really good at repairing eroded soils by retaining deep soil water and keeping the damaged medium more moist.
There is so much more to this plant I can babble on about, but instead, consider picking up a colony of yarrow and see its benefits in your garden for yourself.
Plant and Prosper!