Welcome to the forum, Vishnath.
I curious to know about your growing conditions. Does Tamil Nadu have a tropical climate (no freezes)? Almost everyone in the USA has to deal with winter weather that includes some nights of freezing temperatures, this being a challenge to our hibiscus. Only southern California close to the ocean and perhaps far south Florida do not have these regular freezing nights. So many people who grow hibiscus have to grow them in pots so they can move them inside a greenhouse, house, or other protection during the coldest winter nights.
Charlie
Mr. Charlie, here in Tamil Nadu we don't get any freezes in a whole year. The temperature in night during winters remains from 17°C to 25°C. So, we don't have any problems in growing Hibiscus outdoors.... And yes Tamil Nadu has Tropical Climate. The summer months range from 30°C to 39°C. And we get two rainy seasons, South West Monsoon (June to September) and North East Monsoon (October to December) ... From January to March 1 we have cooler weather and from March the summer months starts and ends in June 1.