My Daphne is "yellowing" on the leaves as Fall set in. What do I need to do to bring leaves back to green? It is parked next to a Rhody(rhody is doing fine) in back yard and has morning sun but shade after 12-1pm. Thanks. You answer this question and you`ll bee my best friend.
Yellowing of leaves can indicate a lack of nitrogen, iron or manganese. I found this article from U of Illinois extension that has a really good explanation and what to check first https://web.extension.illinois.edu/cfiv/homeowners/070828.html. If it’s primarily the oldest leaves that are yellowing then it may be normal in that those leaves will die off. That said, you need to be careful about fertilization this time of year. Although it's an evergreen, the nutrition requirements are lower because the days are much shorter. It may be worthwhile to have a soil test done to check pH, macro and some micronutrients. Locally we refer folks to http://www.al-labs-west.com/ There is information for how to take a sample and a cost structure for analysis.