does water or soda make a plant grow faster?

Answer 1

One will grow more optimally. Plants do not need additional sugar they make enough for their needs through photosynthesis. If you used sugar heavy juice or soda there could eventually be a problem of root dehydration if the sugar builds up faster than the soil bacteria can consume it. Small amounts at low concentrations infrequently would not do any harm but on a regular basis it is much better to give plants water. Plants can take sugar up through their roots if the concentration is very low but at high levels the cells of the root will lose water. This means the root cells will lose turgor pressure and no longer supply the plant with needed water. The plants will likely wilt rather abruptly if this happens.