Each plant (or seed or bulb) will respond to different environmental factors, such as temperature, amount of sunlight, light quality, and more. As these conditions change, chemical production inside the plant triggers the growth. In response, the plant will begin to sprout new growth. Many plants start growing when temperatures get warmer or the days get longer. Each plant will have specific responses, some needing higher temperatures or more light before growing. Others require less. Likewise, cooler temperatures can tell the plant to redirect the energy back to the roots, set seed, and die back for the fall.