I do love them.The colors fade pretty fast - esp my favorite one - the terracotta one, but the foliage has fooled so many people looking through my gardens into thinking they are ferns, so yarrow is still very good in landscapes.
They will also stop bleeding, quite amazingly. Works just as good as alum on cuts while shaving.
I cut my myself one time really bad out in the yard. My son was little then and he was trying to get in the house to get me a rag, but we were locked out. I grabbed up some of the yarrow and it stopped the bleeding - very fast and to the relief of my son.
But what I love the most is the smell. It is not like lavender or lilac which are sweet smells, but it is medicinally and clean smell. So, does that make me weird?