Answer: I suspect that your new plant is still becoming accustomed to its new home. As it adjusts it should bloom as expected.
It is often said that hibiscus like much the same conditions as people and with temperature, that is pretty much true. For best results and lots of blooms, hibiscus should be located where the temperature remains between 60 and 90F most of the time. Short periods of either hot or cold will not injure them though they may show their displeasure by shedding a few leaves or dropping some developing flower buds.
If temperatures routinely drop below 50F, particularly at night, most growth and blooming will stop until it warms up again. Flower size will become much smaller and the occasional blooms may also be misshapen.
Temperatures below freezing will injure hibiscus. Factors such as how cold and for how long, the age of the plant, and whether it is dehydrated determine how extensive the damage. Under 30F for many hours will most likely kill the plant entirely. Such temperatures must be avoided.
Temperatures over 95F will often cause most flower buds to drop off. Hibiscus can survive temperatures even as high as 115F, provided they have adequate water. When the weather is hot, it is best to maintain a steady supply of water to the plant, rather than have it go through wet/dry cycles.
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