Is this "powdery mildew" or something else?
I bought a tiny little 2 inch mum from Trader Joe's the a couple weeks ago. There was this white stuff on it and I thought it was just dust or something but it seems to be stuck onto the flower. I'm not sure if this is normal or not. After googling I came across "powdery mildew" which sounds like what it looks like, but from what I have read seems to be only on leaves. My plant, it's just on the stems (see picture). Is this bad? Should I throw it out? Or will it be okay?
I'm also wondering, the flowers quickly died, I'm presuming from a lack of water because the water goes away very quickly in such a small plant. It happened a few times that the flowers would wilt, but after rewatering they would spring back to life, but not this last time so I cut them down. I'm wondering if I repot into a larger pot if maybe the flowers will do better?