Q.My Hibiscus Is In A Pot On My Deck That Gets Morning Sun Until About 400. The Leaves Are Turning Yellow, Too Much Water?
Not enough sun? Feeding it once a week..
Certified GKH Gardening Expert
Unfortunately, your photos did not come through, and you don't mention the results of a soil test or moisture meter.
It could be any combination of issues, unfortunately. These articles will help you to test the soil:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
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/garden-how-to/soil-fertilizers/test-soil-for-pests-and-diseases.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/making-sure-soil-drains-well.htm
This article will help you to know what care these shrubs require:
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-container-care.htm