Prunella vulgaris aka Self Heal

Prunella vulgaris, also known as common self-heal, heal-all, woundwort, heart-of-the-earth, carpenter's herb, brownwort, and blue curls, is a herbaceous plant in the mint family. It is a perennial wildflower that can grow from 5 to 30cm high with reddish stems that are tough, square, and self-rooting. This plant is found in anthropogenic habitats, meadows, fields, and along the shores of rivers or lakes. Self-heal has been used in traditional medicine around the world due to its healing properties. The Algonquin of Quebec used it as a fever reducer, while the Nlaka'pamux drank a cold infusion of the whole plant as a common beverage. The young leaves and stems of self-heal are edible and can be eaten raw in salads. The plant can also be boiled and eaten as a potherb, and the aerial parts of the plant can be powdered and brewed in a cold infusion to make a beverage. Self-heal is also useful as a host plant for the Clouded Sulphur butterfly. However, if you need to get rid of self-heal, killing it with a selective weedkiller is an option if you only have a few plants. The herbicide kills the plant at the root, increasing the chances of eliminating it the first time.