This technique will NOT work on many kinds of trees.
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In air layering, you remove a small strip of bark from a branch, cover the exposed area with moist soil or sphagnum moss, and wrap it tightly with plastic to keep the moisture in. After a few weeks or months, roots form at the wound. When the roots are well developed, the branch is cut below the new root ball and planted as a new tree.
Air layering does not work well on trees with very hard, dry, or resinous wood that resists rooting. Pines, spruces, firs, cedars, junipers, and most conifers rarely succeed because their sap and bark structure prevent root formation.
It also fails on trees that depend on deep taproots for survival, such as oaks, walnuts, hickories, and pecans. These species cannot easily regenerate roots from a branch because their growth hormones are concentrated in the taproot zone.
In general, air layering works best on tropical, subtropical, and softwood species like citrus, figs, guavas, and magnolias, but not on most hardwoods or conifers.
Source: ChatGPT
Disclaimer: ChatGPT can and will make mistakes.
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