El acodo o amorgonamiento terrestre y aéreo es un método artificial de propagación de plantas, que consiste en hacer posible la aparición de raíces. El acodo consiste en obligar por medio del calor, la humedad de la tierra preparada y de incisiones o ligaduras a que echen raíces las ramas acodadas formando nuevos individuos dotados de cualidades idénticas a las de la planta de que derivan. Las ramas acodadas echan raíces tanto más fácilmente cuanto más tierna sea la madera y sus fibras estén más separadas lo cual se explica teniendo en cuenta que todas las operaciones de acodadura solo se dirigen a detener y dirigir la savia a la parte de la rama o ramas que se acodan. Aún cuando el acodo se practica en todas las épocas del año, la estación más a propósito es la primavera por ser la época en que la savia empieza a ponerse en movimiento. La tierra con la cual se hace el acodo debe ser muy sustanciosa, suave y fresca, siendo indispensable siempre cubrirla con mantillo u otra materia que conserve la humedad. Existen dos tipos de acodo:

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Layering is a means of plant propagation in which a portion of an aerial stem grows roots while still attached to the parent plant and then detaches as an independent plant. Layering has evolved as a common means of vegetative propagation of numerous species in natural environments. Layering is also utilized by horticulturists to propagate desirable plants. Natural layering typically occurs when a branch touches the ground, whereupon it produces adventitious roots. At a later stage the connection with the parent plant is severed and a new plant is produced as a result. The horticultural layering process typically involves wounding the target region to expose the inner stem and optionally applying rooting compounds. In ground layering, the stem is bent down and the target region buried in the soil. This is done in plant nurseries in imitation of natural layering by many plants such as brambles which bow over and touch the tip on the ground, at which point it grows roots and, when separated, can continue as a separate plant. In either case, the rooting process may take from several weeks to a year. Layering is more complicated than taking cuttings, but has the advantage that the propagated portion continues to receive water and nutrients from the parent plant while it is forming roots. This is important for plants that form roots slowly, or for propagating large pieces. Layering is used quite frequently in the propagation of bonsai; it is also used as a technique for both creating new roots and improving existing roots.

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