Plants use their roots to get oxygen. Oxygen is dissolved in water, and there's also air pockets in their grow medium to provide a source of oxygen. When you water your plants too often, its roots are sitting in stagnant water which no longer has any oxygen left.
Which point(s) in the water cycle below best illustrate(s) water changing to a gas, and which term(s) could describe it? Is it.. 1; sublimation & evaporation. 2; evaporation only.
But back to your question - it's not why can water turn into ice (solid), vapour (gas) and liquid again, these are just changes of physical states (they are all still water just in different forms). The role of temperature is just a measure of how much vibrational energy that is possessed by the water molecules.