Thomasia gardneri, the Mount Holland Thomasia, a plant species in the genus Thomasia
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Tillandsia gardneri, a plant species native to Brazil and Venezuela
Rhizanthella gardneri | Ginkgo gardneri | Tillandsia gardneri | ''Fundulopanchax gardneri nigerianus'' "Makurdi" – adult male from a locality near Makurdi | Fucus gardneri | Banksia gardneri | Atriplex gardneri |
Banksia gardneri, the prostrate banksia, a shrub species found along the south coast of Western Australia
Fucus gardneri, a seaweed species living on the littoral shore of the Pacific coasts of North America
Rhizanthella gardneri, the Western underground orchid, a plant species found in Western Australia