Q.hibiscus plant leaves keep turning yellow
Why are my hibiscus plant leaves turning yellow? I tested the soil and it’s slightly on the acid side, which I’m told they like. I fed once with Miracid. I use a water meter and I don’t water it if the meter doesn’t say dry or almost dry. We have had a lot of rain and my plant is in the ground. I still have blooms but losing at least 10 leaves per day. What am I doing wrong? Please help!

There are several reasons this can happen, normally associated with stress of some kind. This article explains many of them and will help you decide which is likely for your plant: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/answers-to-what-causes-hibiscus-leaves-turning-yellow.htm