Answer: I, too, have a few cedar stumps on my property and I've successfully grown annuals in them. The stumps have been excavated enough to hold plastic pots, which are filled with potting soil. I believe you could do the same with your azalea - plant it in a pot and sink the pot into the stump. I'd be concerned about planting directly in the stump; adequate drainage can be an issue and there's a possibility that the natural oils in freshly cut cedar might harm the roots of your plant. To absolutely ensure the success of your azalea you might want to go the pot within the stump method.
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