Plumeria Branch Wrinkled . Making a plumeria branch this is the best way to encourage plumeria branching, as two or three new branches will emerge from each cut. Use your finger or the handle of a trowel. Urgent Help Required For Plumeria Obtusa from www.houzz.com Add more potting mix to the top of the soil to help hold the cutting in place. If the plant has grown out of control, you can prune drastically, about 12 inches (30 cm.) subsequently, question is, can you. Add a little superthrive (follow mix instructions) or hydrogen peroxide (use 1/2 cup to 1 gal).