The aim of the paper is to analyze instances of vegetalization, which is the X IS A PLANT metaphor, in John Henry Newman’s collection of sermons, published as Sermons on Subjects of the Day (1843). One group of metaphors are ontological metaphors, whose source domain is an entity (Lakoff, Johnson 2003[1980]). They can be classified as reifications, vegetalizations, animalizations, personifications, and deifications, which corresponds to the hierarchy of the so-called Great Chain of Being. As claimed by Krzeszowski (1997), these metaphors play an important role in expressing the axiological dimension of language, since they can express specific values of their target domains. In Christian discourse, vegetalizations contribute to the conceptualization of such notions from the religious sphere as God, grace, the Kingdom of God, the Christian life, the Church, or evil.