Q.Yellow leaves
Our edgewortiea is in well shaded area with dappled AM sun for a short period of time. All appears well except many leaves turn yellow. They are spread throughout the plant. This happens regularly, weather rain and/or drought
Thanks
Growing conditions needed are full sun to part shade and you need to provide deep moist soil with high organic matter.
Edgeworthia leaves turn yellow in the fall and sporadically through out the year.
Your description sounds perfectly normal for your plant.
https://www.gardeningknowhow.com/garden-how-to/info/plant-dropping-leaves.htm