Quadrotriticale (pronounced "quádro-trítĭ-kay-lee") was a high-yield, perennial, four-lobed grain, genetically engineered hybrid of wheat and rye with a bluish color. The root grain, triticale, could trace its ancestry back to 20th century Canada. Pavel Chekov, however, claimed that "it [was] a Russian invention." As of 2269 it was the only Earth grain able to grow on Sherman's Planet.
In 2268, Federation undersecretary Nilz Baris transported several tons of quadrotriticale to Deep Space K-7, intending to send it to Sherman's Planet. He ordered Captain James T. Kirk of the USS Enterprise to protect the grain.
The grain, however, was later discovered to be poisoned by the Klingons, through the assistance of their Intelligence operative, Arne Darvin. The discovery was made when untended tribbles got into the grain silos and ate the poisoned grain, and soon after died from the poison. (TOS: "The Trouble with Tribbles")