Aconite/Wolfsbane

Species of flowering plants belonging to the family Ranunculaceae. Most species are extremely poisonous and must be dealt with carefully.

The name comes from the Greek ἀκόνιτον, meaning "without struggle". Toxins extracted from the plant were used to kill wolves in older times, hence the name wolf's bane.

Uses in Witchcraft

Also known as Wolfsbane, it can be used to make a wash for ritual tools & space.

Note: Poisonous, do not ingest.

wolfsbane

Information 

In most TV shows and Movies wolfsbane is a herb of some kind that is extremely toxic to werewolves

Wolfsbane has a similar effect on werewolves as vervain does on vampires. When ingested, wolfsbane causes a werewolf to become severely weak and feverish. Although, if a werewolf’s skin is exposed to wolfsbane, it can result in burning them just like vervain has the effect on vampires.