|I have two varieties of yarrow (Moonbeam and the regular white type) growing side by side and the last two years the white flowering one gets way too tall and falls all over the place. I'm not sure what I am doing wrong. This year I heavily divided it so it would be more compact as it was the first year but still it has toppled over. Even more vexing is my neighbor who has the same type and hers is tall and perfect. I want the height and it is lost when it lays all over the bed! Why is it doing this?|
|The Achillea millefolium types tend to sprawl, especially if grown in less than full sun all day long or if grown in moist or rich soil or overfertilized. There are some different "lookalike" types, too, so you might ask your neighbor for some of theirs next time they divide it. A. "Moonbeam" on the other hand is a more upright grower with a distinct crown, and dopes not spread out the way the millefoliums do.