Answer: The urn probably does not have drainage holes in the bottom, so I'd suggest simply placing a potted plant in the opening rather than actually planting in the urn. You can use one of the smaller azaleas, or a heather. Both adapt well to containers. For a shady exposure, how about a fuchsia or maidenhair fern? Some trailing plants to consider are Thunbergia (black-eyed Susan vine), petunias, or trailing verbena.
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