Black spots taking off cucumber plant
I need help figuring out why my cucumber plant has black spots underneath the leaves. And why the smaller, newer leaves have tiny black spots all over them. I'm very new to gardening and still learning a lot. Any help/feedback would be greatly appreciated.
Certified GKH Gardening Expert
This would be a fungal infection. This is common with soils that are compact, or that don't drain well. It also shows up in container if the soil remains wet for too long.
You can replace 1/4 of a container of water with peroxide the next time it needs water. This will help fight the illness, and will allow you to get some fruit from the plant.