Wow, that is really too bad. The lilies will probably return from the ground in time, but the dianthus and mums will probably not. They will need to be replaced. Now that it is late summer I would put in some of the large flowered marigolds as they will provide dramatic color right up to the first frost. Then you can put in pansies, violas and dusty miller, or some ornamental kale or ornamental cabbage.
Sorry to hear about the tragic blunder and your loss of plants.
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