Achillea millefolium, native (whiite/pink) yarrow is also herbaceous. With water and sun the delicate foliage will quickly fill a space. In the first year, it will take its time -appearing to us to be doing nothing. Know that at this time the plant is strengthening its root system and from year two on, becomes very drought tolerant. To control its spread, decrease watering. Native Yarrow is a strong native pollinator attractor. Perhaps its best use (but not commonly known)…native yarrow can be mixed into a lawn and mowed at 4 inches making other plants stronger and drought tolerant.