Herbicidal Blood is an Item that can be found within common locations, including choice enemy Camps, given by Spouses, and rarely as a reward from Seasonal Festivals. Upon being picked up, all killed Enemies will cut all Weeds in a 2x2 area relative to the location of the Enemy's death. Note that this does not necessarily guarantee that four Weeds will be cut each time an Enemy is killed; the Enemy needs to be positioned directly on top of Weeds in a 2x2 area in order to cut the maximum amount. Otherwise, only the given amount of Weeds in that immediate 2x2 area will be cut, which can potentially be fewer than four.
Compared to other means of cutting Weeds, Herbicidal Blood is among the most efficient, as the only effort on the player's part will be killing Enemies. This means that the player can potentially clear several Weeds in a single night should they aim to kill Enemies by them. By comparison, purely in regards to clearing Weeds, Pollen Blood is less efficient, due to its ability to alter only one Weed instead of four. Because of this, if the player is aiming purely for removing Weeds then Pollen Blood is a less effective option. However, unlike Herbicidal Blood, Pollen Blood is able to spawn Flowers, and hence serves as an overall better source of Cashews. This alone can make Pollen Blood more valuable overall, and as such the player may desire to take it over Herbicidal Blood when given the option between the two.
The following is a list of possible Items that can affect Herbicidal Blood: