Layering (horticulture)
Layering (horticulture)
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Layering (horticulture)

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Layering (horticulture)

Layering is a vegetative propagation technique where the stem or branch of a plant is manipulated to promote root development while still attached to the parent plant. Once roots are established, the new plant can be detached from the parent and planted. Layering is 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.

Common types of layering include air or water layering, tip, Compound (serpentine), mound(stool), and air layering.

The horticultural layering process typically involves wounding the target region to expose the inner stem, called the inner cambium, and optionally applying rooting compounds.

Layering 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.

In ground layering or simple layering, the stem is bent down and the target region is 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.

Compound or serpentine layering consists of multiple simple layers on one branch. Target regions are buried then reemerge from the soil, including at least one bud between the buried regions. This results in multiple propagules, or baby plants, from one stem or branch. The end results looks like a serpent swimming in water.

Tip layering involves burying a shoot tip of a low hanging branch to initiate root development. Start by digging a small hole approximately 3-4 inches, Create a small wound on the bottom of the shoot tip you intend on propagating. Then optionally apply rooting hormone. then bend the desired branch tip to the ground, leaving 6-12 inches of the branch exposed. Then, bury the entire shoot tip. The shoot tip will produce new roots and emerge from the soil.

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