To propagatedieffenbachia quickly, stem cuttings are the best choice. Stem cuttings can be rooted in potting medium or in water. Any dieffenbachia that has offshoots (a sprout that branches off the main plant) can be propagated through this method. Propagatingdieffenbachia through root division is simple. How to PropagateDieffenbachia. Propagatedieffenbachia in one of four ways—division, stump propagation, stem cuttings, or air layering. Propagating Via Division. propagated from stem cuttings. There are two main methods: rooting in water or in soil. Step: Choose healthy dieffenbachia stem. and cut into at least 4-5 inch lengths. How to propagatedieffenbachia. Dieffenbachia can be propagated by tip or stem cuttings and root division. The easiest method to propagateDieffenbachia is to separate the rootball into smaller plants while the plant is still young and without a central stem. How to PropagateDieffenbachia to Grow Extra Dumb Cane Plants. If you want to propagate many new dieffenbachia plants all at once, this is a good way to do it, because you can turn a single stem into three or more. How to PropagateDieffenbachia Plants. The easiest way to propagate your dieffenbachia is by rooting cuttings, either tip cuttings or stem cuttings.