I have beautiful yarrow, but of course, it is very invasive and I would like to keep it in one area.
How Do I Control Yarrow to Keep It From Taking Over Flower Bed
Certified GKH Gardening Expert
The easiest way to to make sure that you cut the seed heads off after they fade. Most cultivated varieties of yarrow do not become invasive, but common yarrow (the white kind) can become invasive and you need to be diligent about removing seed heads to keep it in check.