Yarrow
Medicinal Uses: antispasmodics, astringents, colds, fevers, digestive
Yarrow is one of the those plants, well, they almost resemble weeds because you will see them growing all alongside of roadways and freeways across America. But this seemingly noxious plant, is actually an herb with a proven medicinal history.
Yarrow grow between 10 and 20 inches, is a perennial herb that yields a single stem that is fibrous and rough. It flowers in several bunches of flat-topped panicles of numerous small white flower heads which bloom from May to August. They really are beautiful and truly, I've always thought they were a wildflower probably due to their propensity to flourish in open fields.
For medicinal use, gather stems and leaves in the flowering stage and hang them upside down to dry thoroughly. They will be ready to use medicinally after they are dried. All parts of the flower are used for this purpose. Store in dry air-tight containers that will not receive much light.
To make a Tea: steep 1 heaping tsp. in 1 cup boiling water for 30 minutes. Drink 3 or 4 cups per day an hour before meals and upon retiring. It must be warm to be effective. Source: http://medicinalherbinfo.org/herbs/Yarrow.html.

Read more of Good Living's Medicinal Herb series.