A distinct cultivar of Dahlia plant named `Gallery Cezanne`, characterized by its suitability for potted plants, garden or patio plants, or as cut flowers; upright and spreading, very compact and freely branching plant habit; medium green foliage; early and profuse flowering; rapid growth rate; decorative-type inflorescences that are about 9 cm in diameter; bright yellow ray florets; and excellent postproduction longevity.
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