They're likely adventitious roots or support tendrils—not necessarily a propagation advantage. In nature, jade plants (Crassula) use these to anchor spreading stems to rocks or soil.
Usually indicates the stem is seeking soil contact—often from low light causing etiolation (stretching). More sun = shorter stems = fewer aerial roots.
Take 3-4 inch cuttings from healthy stems, callus, root in 50% potting soil/50% perlite. Water sparingly until rooted. The parent plant will branch at cut points, becoming fuller.
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