Plants require light, water, oxygen, minerals and other nutrients for their growth and development. Apart from these external requirements, plants also depend on certain organic compounds to signal, regulate and control the growth of plants. These are collectively called as Plant Growth Regulators or Plant Growth Hormones. There are different types of Plant Growth Regulators, which are also referred to as phytohormones. Let’s learn about them in more detail below, Plant growth regulators can be defined as chemical substances that control all the aspects of growth and development within plants. They are also referred to as plant growth hormones or phytohormones. Plant growth hormones are organic compounds which are either produced naturally within the plants or are synthesized in laboratories.  They profoundly control and modify the physiological processes like the growth, development, and movement of plants.