Gardenia is bitter and cold in nature and is well-known as an herb which can clear the heat from all three jiaos in the triple-burner. In his book On Cold Damage, Mr. Zhang Zhongjing dedicates some lines to its use to clear heart fire. The are three ways he uses Gardenia(栀子)here.
With 香豉
With 甘草 and 香豉
With 生姜 and 香豉
With 枳实 and 厚朴
With 干姜
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[...] Using Gardenia to clear heart heat [...]