Achillea millefolium californica, aka Common Yarrow, California natives: Don't let these beautiful butterfly-feeding blooms misle`d you! Common yarrow can be a brilliant IdealMow lawn alternative. If you enjoy the blooms and butterflies, leave it long. If you prefer a soft, yellow-green lawn, mow it down a bit. Another alternative: don't choose! Mow a patch and leave a border long for a low maintenance flowering border.