What insect is making holes on the leaves of my hydrangea? I have tiny slimy slugs that come out at night, but I read on hydrangea they never mention slimy slugs or holes, just fungus, yellow leaves, etc. I live in near Sacramento, CA.
Certified GKH Gardening Expert
I suspect the culprit is slugs, since they do come out at night and disappear during the day. While you would not always see them, if you know for certain they are there or find evidence of their nightly visits, this should confirm the fact that they are munching on your shrub. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/facts-about-slugs-and-how-to-kill-garden-slugs.htm