How does capillary action work in plants and trees?

Capillary action in plants and trees is the process by which water is drawn up from the roots through tiny tubes called xylem. This happens due to the cohesive and adhesive properties of water molecules, which allow them to move upwards against gravity. As water evaporates from the leaves, more water is pulled up through the xylem to replace it, helping to transport nutrients and water throughout the plant.