This yarrow is the happiest of any of the yarrow plants in the garden. It is next to the back patio and gets solid, bright but morning-only sun. I know yarrow gets marked as wanting full sun, but I think giving it a bit of a break at some point during the day is probably helping out–at least for this plant. There is also a bachelor’s button plant next to this. Last year I planted (and grew) in this spot a bachelor’s button that had dark maroon flowers. I had thought when this came up at the beginning of the spring that maybe it had reseeded. Whatever the situation, the flowers on this plant are not the deep maroon color. It does look lovely next to the yarrow.