In the science of plant biology, a plants stem consists of nodes and internodes. A node on a plant is simply the location on a stem to which a leaf or branch is attached. Nodes are the points on a stem where the buds, leaves, and branching twigs originate. They are crucial spots on the plant where important healing, structural support, and biological processes take place. It is here that small buds develop into leaves, stems, or flowers. When pruning, it is important to locate a plants nodes. Generally, you want to make a pruning cut just above, but not too close to, a node. Pruning in this manner encourages the buds at that node to begin development and ultimately form new stems or leaves.

The area between two nodes is called an internode. Its length depends on many factors, including genetics. Several other factors also can influence internode length, such as reduced soil fertility, lack of light, and the season.

In summary, a node on a plant is a critical area on a stem from which leaves, branches, and aerial roots grow out from the stem. It is also where small buds develop into leaves, stems, or flowers. When pruning, it is important to locate a plants nodes and make a cut just above, but not too close to, a node to encourage new growth.