Click here for a photo of the blooms.  This perennial Yarrow's attraction is not only its sulphur-yellow flower heads but also its silver, fern-like foliage that has almost a frosted appearance.   This clump-forming perennial plant grows from 6 to 10 inches high, with flower stems reaching up to 24 inches.  Grow this pretty yellow Yarrow in summer in full sun and well-draining soil, and be sure to deadhead to prolong blooms.  This easy to grow perennial makes lovely cut and dried flower arrangements.  Zones 4-8.   Quarts.

I used to take this native Yarrow for granted:  it isn't one of the showy colors one sees in garden centers, and it is seen so frequently that some might consider it weedy.  It led me to ask, why would one want so "lowly a creature" in a refined flower garden?  I found out I was so wrong when one appeared in my rock garden out of nowhere; now I am able to see that this common yarrow is not so common after all.  Its feathery,  green foliage and large white flower clusters are uncommonly beautiful.  It's amazing how much more desirable it is without all the road dust and without competition from taller and more aggressive wildflowers.  This hardy native grows from two to three feet in sun.  Zones 3-8.  Quarts.

No photo just yet, but take a look at "Apple Blossom" here.  "Apple Blossom" is another great Yarrow for the garden, but aren't they all?  "Apple Blossom" is easy to please and grows from 24-30 inches in full sun and well-drained soil.  Blooming from June to August, the flowers of this lovely Yarrow, much like apple blossoms themselves, open in various shades of pink, fading to near white as time goes on.  There is always a wide array of color to suit just about anyone.  Zones 3-8.  Ideal for cutting or drying.  Quarts.

This is the Yarrow I have grown in my own perennial garden for many  years and the one you probably saw in your grandmother's garden way back when.  This easy to grow, spreading pink perennial Yarrow grows to about 18 inches tall with deep green, fern-like foliage and soft pink blooms that last for quite some time and are ideal for cutting.   This is my favorite Yarrow for its color, delicate foliage, long blooming period, and, especially, its loyalty.  Easy to grow; deer resistant.  Sun/part shade.  Zones 3-8.  Quarts.

I don't know the name of this yarrow, or if there even is one.  It is one of two colors that I have culled from a "Colorado" mixture, discontinuing the others.  Each bloom is a rich coral pink with a yellow eye.  It couldn't be prettier.  Zones 3-8.  Available spring, 2013.  Quarts.

My camera isn't able to capture the color of this Achillea, but it transitions from a burnt orange to a strong yellow.  I can say one thing for it - no, two things:  It is one of the longest blooming yarrows I've grown for some time and one of the best colors, too.   Information for this yarrow is the same as for the ones above.  Zones 3-8.  Quarts.

Achillea nobilis, or Noble Yarrow, is native to parts of Asia and Europe but has become naturalized in North America.  Different from the white-flowering Achillea millefolium, Noble Yarrow has, instead,  creamy/soft yellow blooms and greenish gray, very fine, lacy foliage.  By itself or mixed with other colors of Yarrow, this one is perfect for adding color to late summer gardens when most everything else has faded.  Achillea nobilis grows to about 12 inches high in full sun and well-drained soil.  The fresh flowers are perfect for cutting, but they also are suitable for drying.  Zones 4-8b. (Watercolor by Jacob Sturm, public domain, from Wiki Commons).