Answer: The only possible way to stimulate new growth on the bottom of your dieffenbachia is to prune it below the foliage to stimulate the dormant buds along the stem. It will look like a stick for awhile, but eventually will regrow new leaves. When you're growing the plant, be sure it gets enough light on the bottom leaves, so they don't drop. Loosing the lower leaves is normal, by the way.
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