Using a sharp knife split the plastic pot in half. Carefully remove as much of the plastic as practicle. One of many ways to re-mount them is to plant each half in the top of a coco fiber basket, packing long strand sphagnum moss around the top and stablize the setup by tying the plant and moss into the fiber basket with ~ 10 lb fishing line. Water as normal place in good ventilation, 50% shade and enjoy.
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Thanks for the help! I think I'll try it on one of the pots this weekend and see how it goes. I love your dove shot. We are just south of Houston and have enjoyed many a dove nesting in our pots.