Answer: This is an interesting problem! I would first check that there is no water sitting in the drainage saucer beneath the draceana. Then I would check to be sure the drainage holes in the container are functioning. Sometimes waterlogged soil can eventually smell bad. Then I would carefully examine the plant and see if any area on the stem might be rotting. Check too if you have a cat, to see if it may have used the soil surface as a litter box. Next I would gently unpot the plant and carefully examine the potting mix -- wearing gloves or sorting through it with a trowel. Perhaps something foreign became encorporated in it. If that doesn't reveal anything, you might just repot with fresh potting soil and see if that doesn't correct the problem. I hope you can locate the source soon!
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