Plant leaves turning yellow
My hydrangea's leaves are turning yellow and have dark spots on them. The leaves throughout the plant are turning light yellow. And it just doesn't look good and is not growing well. I.am in zone 9 Sacramento. What if anything can I do to perk it up.
Sacramento County California
Thank you for your question. Your plant's leaves appear to be chlorotic, which means they turn yellow for a lack of nutrients, typically nitrogen. However, the chlorosis plus the spots may mean that your plant is infected with a fungus, described here: https://www.uaex.edu/publications/pdf/FSA-7570.pdf
I would suggest that you take some leaves to your county Extension office, so the spots can be examined under a microscope there, or sent to a lab for analysis. Here is their webpage: https://ucanr.edu/sites/UCCE_Sacramento/