Shade plants from direct sun while in the car. Do this even though the air conditioner has cooled the air temperature. When considering how to care for houseplants, it is important to decide if growth is desired. It is usually easier to maintain a plant in the home rather than have it grow in size. Plants have varying growth rates.
Younger plants grow faster than older plants.
Growth rate varies with factors in the environment. Plants have seasonal growth fluctuations. In the spring, as days lengthen and intensity of light increases, houseplants grow quickly. As the days begin to shorten in late summer, growth gradually slows. During winter, most houseplants do not grow.