Salvia buchananii, or Buchanan's sage, is a species of flowering plant in the mint family Lamiaceae.

It is a herbaceous perennial or subshrub that was only found in the wild in the northeastern extreme of the state of Querétaro, Mexico, after fifty years of cultivation as a garden plant.

[1] During the 1950s an unidentified species of Salvia was found in the garden of an English family in Mexico City.

[2] A seed from the garden plant was taken to England at around the 1960s, where it was then grown by Sir Charles Buchanan.

The flowers are a rich magenta, about two inches long, which rarely set seed.