One of the main reasons plants do not usually move from place to place is because they are rooted into the ground by their roots; roots also provide support so the plants don't fall over. The roots are able to provide plants with water and nutrients from the soil. Some roots are very thick, like in trees, or can be thinner. Their distribution and how far into the ground they grow depends on the availability of water in the area which they grow and the properties of the soil they grow in (the longest roots would be in a desert, and the shortest in a tundra).

Plants themselves usually do not move once they begin to grow, however plants are constantly moving. How? Because their seeds and pollen can be transported from place to place by the wind or insects. So one plant growing in one area could be transported and grow in another area if pollen or seeds disperse to that area. Individual plants cannot move, but populations can if they are not already rooted in the ground.