And against witches and magic. Almost every part of the plant is actually edible - here in Iceland, the stalks were peeled and boiled and eaten with butter, or with milk and cream. The roots were eaten raw or boiled, with dried fish or dulse, the seeds were used as spice, and the leaves were used for salads. Sort of sweet and green, a coolish sort of flavour, not extremely strong, but pleasant. But make sure you get the right species.
Mistakes can be fatal.
Not a problem here - there are only two species, Angelica archangelica and Angelica sylvestris, and both were used. Certainly some uses were period - the sagas mention digging for angelica roots, and the oldest Icelandic law texts mention them too. Many farms had angelica gardens and it was the only plant used as a vegetable that was grown here throughout the Middle Ages. And rhubarb and angelica jam. And when his foster brother went to look for him, he saw that orgeir was clinging to an angelica stalk for dear life, with a sheer drop of hundreds of meters into the ocean below.