Meadowsweet (Filipendula ulmaria) 

A fabulous tall and regal herb for treating headaches and all pain - like willow bark, the blossoms contain salicylic acid, similar to aspirin. Flowers are held in big cloud-like clusters - can get to 6 feet tall. A nice match to plant with valerian. Flowers are white with a bit pink behind them and smell wonderful and almond like. 

Astringent herb - tannins tighen membranes and can also alleviate disgetive upsets. 

Use as a tea - fresh or dried or as a tincture. I also use dried blossoms in salve making as a pain reducer and tightener.

Needs moisture - but tends to do fine in average garden soil. Sun or part sun. 

This herb is sometimes called Queen of the Meadow; its cousin, native herb Filipendula rubra - a pink flowered version - is tknown as Queen of the Prairie.