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To induce branching, pinch the top of seedlings at about 3-4 month-old, then apply a thin layer of lanolin containing BA (benzyl adenine). BA is a synthetic cytokinin, a plant growth regulator. In this experiment, I used lanolin containing 4% BA, but I think you can use much less than that. Normally, a minute amount of BA ( about 1 ppm) is used in tissue culture to induce shoot formation. In the pictures below, 2-month old seedlings were treated with BA, and the pictures were taken at 2 months after treatment. You can spray plant with GA (gibberellic acid) after shoot initiation to stimulate stem elongation (plant in the middle right).

Adenium branching inducing by BA/GA tratments.

These are close-up pictures of some BA-treated adeniums.