After you apply this Poison to flora of a small size (roughly less than 3 feet in any dimension) that has been tainted by Ferukhar, it will wither and die within 2 minutes. If the flora is medium or large (roughly larger than 3 feet in any dimension), it will take 5 minutes to perish. This includes plant-based creatures that have been corrupted by Ferukhar.
If a creature has been severely parasitized by demonic plants or fungi, applying the Poison to the creature’s skin is sufficient to ensure that it will kill the parasitic flora. Plants or fungi that have not erupted from the host’s body cannot be killed by this item, as the host’s body breaks the toxin down before it can reach the infection or parasite inside them.
The Poison will not have a significantly negative impact on flora that have not been tainted by Ferukhar, and it will not harm animals at all. The oil is most effectively applied by a spray bottle but it can be applied by hand or brush if needed.
This item is a Poison, with all the rules and restrictions that that carries with it (see the Poison section of the Alchemy page for details), despite the fact that it can only harm plants and plant-based NPCs.