White Yarrow as finely divided, fern-like leaves and a pungent scent. Flowers are white and occur in flat-topped flower clusters. This species has rhizomes and can spread aggressively in home gardens or where soils are moist. It is best used in dry areas where soil stabilization is needed, or as an aggressive ground cover to help choke out weeds. Mature plants can be mowed on a high setting. Flowers attract beneficial insects.