GardeningGreen said:Hi! Did your cosmos improve? I'm seeing the same leaf curling in my young plants and I'm worried!
I don't have an exact answer as to why it started happening but I did notice some issues with my cosmos that might be the cause. First off I was definitely over watering mine. Cosmos like dry conditions, so now I really don't water mine unless its been 5-6 days of scorching heat and no rain. Before this I was watering them everyday. Also, I did however notice after careful inspection that I had a small aphid infestation. They are really small green pear shaped bugs, and from what I have read online they suck the nutrients out of the leaves which can cause wilting. It took me a good while before I noticed them. I also have found these small green bugs with black wings on my cosmos. I don't know what they are but I assume they also might be damaging the plants, so I have started using an organic plant spray twice a day. I pinched off most of the already wilted branches and leaves, and after almost 2 weeks all of my plants look mostly healthy now. So they definitely can recover from this!