Keeping seeds in the refrigerator is usually done to simulate winter dormancy, thus encouraging better germination. To be honest, I would always prefer gardeners' experience to directions on packaging; I've seen too many labels that are less than accurate. Perhaps when they say "warm place," they mean for actually germinating the seeds. Here's an article that may contain a few tips you can use: https://www.gardeningknowhow.com/ornamental/flowers/dianthus/growing-dianthus-plants.htm
Answered on September 5, 2014
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