Hi all, I'm new to this whole forum thing and am excited about having the ability to chat with fellow gardeners.

Now then, this is only my second season having a garden. But all things considered, I think I have done quite well my first 2 seasons, having planted everything from seed!

I was out inspecting all my plants like I tend to do quite often, and I came across something I've never seen. On one of my sunflowers, the underside of a leaf was covered in a very thick white spiderweb looking thing. Has anyone ever seen this? If so, what is it, and it is harmful to my plants.