How Does Temperature Affect Indoor Plants?A plant needs light to make food, which we know as Photosynthesis. Photosynthesis requires energy. Although plants are adaptable, they do best grown within a 70 - 75 degree range. A plant uses energy more when the temperature is warm than when it is cold. They can get used to a cooler room, one with an air conditioner for example, but it is stressful to plants for the temperature to warm up at night and be cooled during the day, when the sunlight is present. The herbs will start photosynthesis with the rise in temperature and there will be no sunlight to produce food. This will result in plants that will not thrive and will probably die.
What Temperature Is BestA plant grows best if there is at least a 10 degree fall in temperature at night. If, as is the case in the hottest part of the summer, temperatures tend to get high and stay high, plants are stressed and become more susceptible to disease. They grow less and can drop leaves, fade and die; even with correct watering.
Because heat rises, it is not possible to create a perfect temperature in a room for all herbs. It would be wiser to locate herbs around a room based on the available temperature zones. Save yourself a lot of money and stress by working with what you have instead of trying to make huge changes that work against the natural rhythm of your home environment.