Something went wrong in the roots. Dry soil or soggy wet soil both are deadly to roots. If the roots were damaged in the planting process or dried out this can also be the cause of the wilting. Don't prune them just yet. Try to maintain even soil moisture and give them time to recover. They prefer a bright shade with perhaps some morning sun. If your plants are in full sun the demands direct sun can put on the plants may be a contributing factor to their wilting.
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