For developing a system of promoting the enlargement growth of agricultural and horticultural crops selected from fruits, fruit vegetables and flowers, an agent of enlarging the enlargement growth of agricultural and horticultural crops is prepared, the agent comprising gibberellin and a cyclohexane derivative of the following general formula (I): [in the formula, R represents hydrogen, C 1 -C 6 alkyl group, C 1 -C 6 haloalkyl group, or phenyl group (which may optionally be substituted) R1 represents hydrogen, C 1 -C 6 alkyl group, C 3 -C 6 cycloalkyl group, or benzyl group (which may optionally be substituted)], or a salt thereof (for example, a calcium salt) as the active ingredients.
