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What plants are they?
I would put them in the conservatory for couple of days, water well first after potting on. Cover with fleece or hang a lace or fleece "curtain" on the sunny side. Then put outside during the day and bring indoors at night. Do this at least for a week. This hardening off is essential for most every kind of plug in my opinion. Plugs would have been brought on in perfect comditions so will not be "tough" yet
I am growing my own petunia, lobelia started from seed and geranium from plug and I am growing all of them on windowsills. These plants are still young and not frost hardy anyway.