Marcotting, also known as air layering, is a method of plant propagation that involves inducing a stem to create roots while still attached to the parent plant. This technique is often used for woody plants that are difficult to root from cuttings. The process involves the following steps:

1. Select a tree or plant and choose a branch that you want to propagate.
2. Make a cut in the bark of the branch and remove a ring of bark, leaving the inner woody tissue exposed.
3. Apply rooting hormone to the exposed area to encourage root growth.
4. Wrap the exposed area with moist sphagnum moss or other rooting medium.
5. Cover the moss with plastic wrap to keep it moist and secure it with string or tape.
6. Wait for roots to form, which can take several weeks to several months depending on the plant species.
7. Once roots have formed, cut the branch below the new root system and plant it in soil.

Marcotting is a simple and effective way to propagate plants, and it can be performed with less skill than other methods of layering. It is a useful technique for gardeners who want to create new plants from existing ones, especially for woody plants that are difficult to propagate by other means.