Even if you've never gardened before, you can grow yarrow with little effort. Yarrow is an amazing perennial that is hardy throughout most of the United States and can withstand heat, drought, and cold. It's valued in the garden for its ferny, gray-green or dark green, spicy-scented foliage and showy, flat-topped clusters of flowers in pink, red, white, or yellow appearing from late spring to early fall. Fern-leaf yarrow (Achillea filipendulina) is one of the best flowers for drying. In fact, it will dry right in the vase. Common yarrow (Achillea millefolium) dries less well but like fern-leaf yarrow, is excellent for cutting. Common yarrow can be invasive in some conditions.