Growth is maturing. Growing is something that you are doing all the time without even having to think about it. You grow a little bit taller every day, although you may not notice it. Over time you will have changed from a child into an adult. But humans are not the only living organisms to grow - animals and plants do too. You may have seen your pet change from a small puppy into a fully grown dog. It's easy to see plants growing - plant some seeds and, before long, they'll have roots and stems.