We purchased a potted tropical hibiscus plant in May..it was blooming and then got spider mites..lost most of the leaves..we nursed it back to health..kept fertilizing it with a recommended fertilizer from a known hibiscus nursery. It bloomed a few times after that and has continued to grow new leaves and is now one of the healthiest hibiscus plants we have ever had...but it has not bloomed now for over 2 months..it continues to get new leaves though..but is not even producing buds. No signs of aphids or any other problems...why is it not producing buds? thanks