Symphytum (comfrey / knitbone)
Whoever named comfrey 'knitbone' long ago knew its mending powers.

Symphytum stimulates the body's own healing abilities to speed healing and relieving the pain of broken, fractured or bruised bones. Any injury that affects the periosteum (outer layer of bones), tendons or sinews can apply Symphytum if tissues need mending. For broken bones, it is best not to take it until the bone is set three days because it starts knitting quickly. It can be particularly helpful for broken bones that do not heal or become inflamed and for painful stumps after amputation.

Its other first aid application is for minor eye injuries from direct blows after proper attention from a healthcare practitioner.