Darnel is poisonous, but in small enough doses can give food a special kick. ... In a big enough dose, this grass, darnel, can kill a person, and farmers would have to take care to separate it out from their true harvest—unless they were planning to add darnel to beer or bread on purpose, in order to get high.

Can tares be eaten?

Tares are usually not taken in sufficient amounts to be fatal to humans, but depending on the amount ingested, they are associated with a broad spectrum of negative effects. At one end of the spectrum tares can simply make bread unpalatable, turning the flour grey and making it taste acrid and bitter.

What is the use of Darnel?

Darnel is one of the many ingredients in mithridate, which Mithridates, the king of ancient Pontus, is supposed to have used every day to render him immune to poisoning.