Yes, the 'Big Brother' houseguests were made aware of ~The Lettuce~

A notable exception was made in the current season of "Big Brother". The show typically isolates its houseguests from outside information.

This season, however, the producers chose to inform the houseguests about a specific topic. The houseguests of "Big Brother 28" were made aware of something referred to as "The Lettuce".

Further details about this unusual decision can be found through KTXS, the local ABC affiliate in Abilene, Texas.