Water temperature has a direct effect on the growth of aquatic plants. Thermal pollution alters the population dynamics of aquatic plants, allowing some species in previously small numbers to flourish at warmer temperatures. Also, some aquatic plants float to the surface in warm water.Click to see full answer. Also to know is, how does temperature affect the growth of plants? Effects On Growth Both increase as temperature rises; eventually photosynthesis slows, and respiration becomes dominant. The plant stops growing because it’s using up food more quickly than it can be replaced. Low temperatures slow the rate of photosynthesis, also slowing the growth rate.Also Know, what is the effect of water temperature on the rate of plant growth? Research shows that the environmental has temperature has more of an effect on plant growth than water temperature. Extreme environmental temperatures cause the plants to develop at a faster rate, but are those same temperatures are detrimental to the reproductive stage in a plant life cycle. In respect to this, do plants grow better with warm or cold water? As long as you don’t overheat the roots of your plant and protect the leaves and crown from the heat, watering with hot water will have no harmful effects. In fact, it’s better to water with hot water than it is to water with very cold water.What is the best water temperature for plants? Watering Temperature The ideal water temperature to use when watering plants is between 62 and 72 degrees Fahrenheit. This avoids shocking the plant with water that is either too hot or too cold.