The green herb bruised, or the juice, applied to any inward hurt, or outward wound in body or head will quickly heal and close it up. It will draw forth any broken bone or splinter, thorn or other thing gotten into the flesh, also healeth old sores or ulcers and boils. Perennial, very easy from seed. Takes 2 years to flower, but well worth the wait. Cultivated since Medieval times at least.
Tea is made from dried leaf.
Useful for headaches and mild nervine.