Ok...
Speedy70 said:
I'm new to this flower/gardening business. What exactly do you mean by root problem?
...think of plants as having threee things to be concerned with in terms of problems;
Up, down and all around.
In this case, up is the foliage and yours is drooping, right? Like it's under watered?
But it's not under watered. In fact your concern is that it is over watered from all the rain and I'll bet you are correct. People's first impressions are correct 90% of the time. It's your plant, your yard and you know what's going on, what you've done with it.
So, down, the roots. NG's do love water and can, typically, when it's hot, be watered every day with no ill effects. What the ydon't like is being wet AND cool, which it's been of late.
I suspect that the coolnesss and excess water have lead the roots on this particular plant to, in essence, suffocate. Rain and more rain and no warm weather to dry things out and keep the healthy transpiration process rolling along. Maybe the drainage for this one plant is a bit slower than the others? The soil just a bit mor clay than the others? Maybe it sits a bit lower and the water pooled around it a bit longer? Good drainage, both in the soil (lose, not to compact, 'breathable') and having the plant sitting in a fashion where it isn't sitting in a low spot and water collects can be looked at.
If this is the case, then, once the roots start drowning, they become vulerable to nature in the form of all the molds and root diseases that, like a common cold for us, always there, ready to pounce and only affect you when you are tired or worn down or not eating right.
Got the reciept? Most places will replace it, especially Home Depot.
Give it a look as to why you think it may be suffering, how it's planted, etc.
Up; The folaige
Down; the roots
All around; the flowers
I'm guessing a root problem from cool and water accentuated by not so good drainage on this one plant or pooling around it that didn'ty happen to the others...or maybe your dog pizzed on it?