Layering is one of the easiest but slowest propagation methods, usually taking 12 months or more, but a new plant is nearly always guaranteed to form. Stems are encouraged to produce roots while still attached to the parent plant, which feeds it during the rooting process. The layer is removed from the parent plant once it has rooted.
The youngest, most vigorous stems have the best rooting ability and these are the best ones to use. If the plant is old and only has old stems, it is usually better to cut back the plant hard first and layering the resulting new, vigorous stems.
As roots form in the dark, it’s important that the area where the roots will form is kept as dark as possible. Warmth will also help the rooting process, so layering is most successful from mid-spring to late summer, but early autumn can also be a good time.