Q.geraniums
My geraniums are growing in a large planter, about 12 feet long. They get good sunlight and have been doing beautifully and producing many blooms. Within the last two weeks, new foliage has turned bright yellow. I live on Panama City Beach where growing conditions seem to be different from any other place I have ever lived! There is strong wind and high humidity. Any suggestions about the yellow leaves?
This article will help you access the plant.
https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-yellow-leaves.htm