Hibiscus plant blooming again

After being attacked by ants for some time, the hibiscus plant was covered with a white layer and no new leaves were growing or flowers blooming. Now after a period of few months, the hibiscus flower buds are appearing in the last week of december, though they are far smaller in size compared to the original flowers.
This year, the first week of december 2015 was quite warm, now the weather is cooler, the ants have disappeared and buds are reappearing