In which generation were recessive traits visible in a few pklants in mendels experiments?

In Mendel's experiments, recessive traits were visible in the F2 generation. After crossing two purebred plants (P generation), the F1 generation exhibited only the dominant traits. However, when the F1 plants were self-pollinated, the F2 generation displayed a 3:1 ratio of dominant to recessive traits, revealing the recessive traits in a subset of the plants.