Why are my hibiscus buds not opening as expected?

There are several reasons why hibiscus buds may not be opening as expected. Some common reasons include inadequate sunlight, improper watering, lack of nutrients, or pests and diseases. It is important to ensure that your hibiscus plant is receiving the right amount of sunlight, water, and nutrients, and to regularly inspect it for any signs of pests or diseases that may be affecting its growth.