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Flowering induction in Amorphophallus muelleri Blume is required for mass production of seeds within a short period of time. Hence, the objective of this study was to evaluate the effect of gibberellic acid (GA3) application on flowering induction for non-flowering-aged corms (immature corms) in A. muelleri. Research was conducted at Leuwikopo Farm, Bogor-Indonesia in May 2015–August 2016. Dormant corms of bulbils (0 year), 1-, and 2-year-old were treated with 0, 500, 1000, 1500 and 2000 ppm GA3. A 3-year-old corm was used as an additional control. Results demonstrated that GA3 application effectively induced flowering in 2-year-old corms. Bulbils flowered at a rate of 1.7–6.7% and 1-year-old corm at a rate of 2.8–16.7% irrespective of GA3 levels; 100% and 50–100% of inflorescences, respectively, were abnormal leading to low seed production. The GA3 application caused erratic flowering in bulbils and one-year-old corms, indicating age-dependentflowering in A. muelleri. The erratic flowering caused a detrimental effect on seed production. In this experiment, 2-year-old corms produced larger inflorescences and a lower number of abnormal inflorescences. Thus, application of GA3 at a level of 1500 ppm on 2-year-old corms is recommended for mass production of A. muelleri seeds within a short period of time. In the future, it will be interesting to study the physiological mechanism of the erratic flowering phenomenon across corm age in A. muelleri.

Gibberellic Acid Application Causes Erratic Flowering on Young Corms of <i>Amorphophallus muelleri</i> Blume (Araceae)