Klorane Shampoo
This gentle shampoo from plant-based beauty company Klorane caters to those with itchy, irritated scalps via the soothing powers of Chinese-grown peony. The lightweight, watery solution foams up to a decent lather that detangles strands, and won't overpower you will a too-strong floral scent.

Soothing Shampoo with Peony Extract, $16, at drugstore.com