As well as water, it is sometimes beneficial to give plants other fluids. Besides liquid plant food, various fluids have gained a reputation as aids to plant growth. One of these is soda water.
Some soda water may include substances that are valuable for plant growth. These can include potassium, carbon, phosphorous, sulfur, oxygen, hydrogen and sodium. Soda water can also affect soil pH in ways that are beneficial for some plants. In experiments at the University of Colorado, some plants given soda water grew faster than those given ordinary tap water.
Whether a plant will grow faster if given soda water rather than tap water depends on the plant's needs and the content of the water. Certain additives in the soda water may be beneficial for some plants, but not all. Note also that flavored and colored sodas have different ingredients than plain soda water.
Plain soda water tends to be alkaline, therefore plants that prefer an acidic soil may be harmed by soda water. Alkali-loving plants include cucumbers, clematis and lilacs. Talk to an experienced gardener or other expert before experimenting.