Plants do not grow bigger if watered with sugary soda. The excess sugars reduce the plant's ability to absorb water through the roots. Plain carbonated water or some sugar-free sodas contain nutrients that plants need to grow, and these can help a plant grow bigger.
About this Author
Jessica Alzarana has a Bachelor of Music in music composition from the University of North Texas, and is currently pursuing a graduate degree in music therapy from Texas Woman's University. Alzarana's essays have been published by UNICEF State of the World Children's Report, BootsNAll, Alarana Atelier, eHow, and Travels.