Notes: The white variety shown here is Achillea millefolium and is naturalised throughout much of the North America. This plant is more weedy, but probably attracts more insects and it can easily be pulled out in sandy soil. The yellow variety shown here is Achillea filipendulina. This species is less likely to spread. Many cultivars and hybrids are widely available but they do not seem to be anywhere near as attractive to insects when compared to the weed that grows on roadsides. Overall, there are better wildlife plants out there that are easier to manage.