Temperature and plant growth

Heat plays a vital role in your garden. Heat is a major factor in determining, among other things, transpiration rates. Transpiration involves the use of about 90% of the water that enters the plants through the roots. It is necessary for mineral transport from the soil, to move sugars and plant chemicals, and for the maintenance of Turgor pressure. An increase in temperature or air movement decreases relative humidity and causes the guard cells in the leafs to shrink, opening the Stomata and increasing the rate of transpiration.
Conventional grow lights are very hot, running from several hundred degrees to over fourteen hundred degrees Fahrenheit at the bulbs surface. This excess radiated heat output adds to the cost to cool your grow environment. Check your plant’s optimal temperature range. When using LED lighting, the heat has been eliminated from the equation. To ensure adequate transpiration rates we often need to supplement heat in order to maintain ideal
growing conditions. The lack of heat also requires additional attention to the root zone, again check the optimal root zone temperatures for the plant species you are growing.
With very little evaporation taking place, there is a tendency for over watering. Cold water can stress plants and reduce water uptake. The root zone temperature needs to remain consistent for ideal growth rates. Root temperature is more important than leaf temperature in achieving plant growth. Water should be room temperature. –AL