Quadrotriticale?...

Quadrotriticale was a high-yield, perennial grain. Specifically, it was a genetically-engineered hybrid of wheat and rye with four distinct lobes per kernel, hence the "quadro-" prefix of its name, and was bluish in color. As of 2268, it was the only Earth grain able to grow on Sherman's Planet. History... The root grain, triticale, could trace its ancestry back to 20th century Canada. However, Pavel Chekov claimed, as he was wont to do, that "it [was] a Russian invention." In 2268, Nilz Baris, the Federation Undersecretary in Charge of Agricultural Affairs, transported several tons of quadrotriticale to Deep Space Station K-7, intending to send it to Sherman's Planet for the purpose of developing it as an agrarian colony. He ordered Captain James T. Kirk, then commanding officer of the USS Enterprise, to protect the grain.

The grain was later discovered to be poisoned by the Klingons, through the assistance of their Intelligence operative, Arne Darvin, who had obtained a post as Baris's assistant specifically to carry out his mission, that of preventing the UFP from successfully developing Sherman's Planet, as the Organian Peace Treaty permitted. The poison consisted of a virus with which Darvin had impregnated the grain, which became an inert material in an organism's bloodstream when eaten; the amount of inert material was directly proportional to the amount of food, thus infected or not, that the organism ate, and within 48 to 72 hours, it prevented the organism from taking in enough nourishment to survive, essentially starving the organism to death. The discovery was made when untended tribbles got into the grain silos and ate the poisoned grain, and soon after died. (TOS: "The Trouble with Tribbles")

This grain was superseded by quintotriticale by 2269. (TAS: "More Tribbles, More Troubles") In late 2373, Quark's quadrotriticale futures contract was completely wiped out, which among other things, worsened the fact that he was "up to his lobes in debt." (DS9: "Business as Usual") ~ From "Memory Alpha Fandom".