The lower leaves on my pieris shrub are turning yellow and dropping off ?
The plant gets morning shade and afternoon sun
Certified GKH Gardening Expert
Can you include photos? This can have several causes. Sometimes a lack of magnesium, phosphorus, or potassium can cause these symptoms. Also, a general lack of light to these areas can also cause this.
This article will help you to care for these: https://www.gardeningknowhow.com/ornamental/shrubs/japanese-andromeda/grow-japanese-andromeda.htm