Hi, all.

I am in zone 6, and I need some help with my dahlias.

My first flush was okay. I deadheaded religiously and a second flush started budding up almost immediately. And it was glorious!

But now, my third flush is starting and all of the blooms are brown!

I've been researching, but I am still not sure what's going on. I think it may be a fungus?

I also think the foliage on my plant is SUPER dense, so I was wondering if it would benefit from a larger pot and a pruning to increase airflow.

Thanks in advance!