Air layering is a technique used to propagate plants, including junipers, by making a wound on a healthy branch or stem, wrapping it in a rooting medium and encasing it in a protective covering.br br The process involves making a wound, wrapping it, and stimulating root growth.br Remember that creating an air layer can be a little challenging, but with the right care and technique, it can yield successful results for propagating juniper bonsai trees.