Princess flower

Also known as the life drinker weed, the princess flower is considered a problematic weed by most. It is depicted in history as dominating gardens where it's planted, draining all nutrients of the soil. This leaves the area withered and sick looking, with the exception of the single bloom of flowers in the center. Normally a mix of purple, red and white, these are in fact all one plant.
The flowers were found to have intense magical properties and were used in several powerful rituals and potions. It was also used by several druids as a spell focus, as well as making the Divine Elixir. The overuse brought the plant to extinction, with the last recorded flowers being stolen from the royal palace of Rivell.