Various concentrations of sodium 2,3:4,6-di-0-isopropylidene-2-keto-L-gu-lonate (dikegulac) sprayed on Rieger begonia (Begonia × hiemalis Fotsch ‘Northern Sunset’) in combination with hand-pinching were compared with a single concentration of (2-chloroethyltrimethyl)ammonium chloride (chlormequat), hand-pinching, and control. Both chemicals and hand pinch were effective in reducing internode length but did not affect overall height, diameter, visual quality, or dry weight. The dikegulac spray in combination with a hand pinch and the 0.10 and 0.16% double dikegulac sprays significantly decreased flower count compared to that of the control.