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Background -Persian shallot (Allium hirtifoliumBoiss.) is an herbaceous and biennial plant belonging to the Alliaceae family. Seed dormancy is common in Persian shallot. Therefore, unlike most plants, Persian shallot is commonly propagated by bulbs. Effect of bulb size on the growth and yield of few plant species has been investigated previously, and their results showed that large-sized bulbs produced more seeds. Effect of gibberellin on the growth and development of different plants is well documented; however, the effect of different concentrations of seeds is not the same. Objectives -The present and foliar application of gibberellic acid on yield, morphological traits, and secondary metabolites of Persian shallot. Methods -A factorial experiment was conducted based on a randomized complete block design with three replications. The experimental treatments were three bulb sizes (small, medium, and large) and four levels of gibberellic acid (control, 3 ). Results -The bulb yield, seed yield, number of bulblets, leaf -1 ) was related to the large-sized bulbs not treated with GA 3 . The application of GA 3 on the medium and large-sized bulbs had a negative effect on bulb yield. The seed yield of the medium that of small-sized bulbs. Using the medium-sized mg g -1 ), whereas foliar application of GA 3 negatively affected allicin content in the produced bulbs so the lowest allicin content (4.72 mg g -1 ) was related to the highest dosage of GA 3 . Exogenous GA 3 at period in all bulb size treatments. Conclusions -By increasing the concentration of GA 3 , the number of produced bulblets was increased. However, the foliar application of GA 3 had a negative effect on the total yield of the bulb and allicin content.

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