Q.Hibiscus Buds Are Small And Wrinkled
only one plant, but newer planting
Certified GKH Gardening Expert
This could be for many reasons. Unfortunately, your photos did not come through, so I am unable to pin down the exact cause, but I can tell you some common reasons why this could occur.
This could be because of planting in the heat, since this would very much affect the plant, negatively.
This could be due to poor phosphorus and potassium levels in the soil, though it isn't likely since the plants nearby are fine.
This could be due to disease at the time of planting. Sometimes, there are diseases that affect the plant, such as Botrytis, Fusarium, and Verticillium.
Another reason would be Potassium and Phosphorus deficiencies. These can cause blooming issues.
These articles will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus