@sreyomac — you can find your zone right here on garden.org. On the top of the screen you should see (left to right) a little house kinda like in Monopoly, then Learning Library, then Plants Database, and stop at Tools & Apps. Click on it and at the very bottom is Zone Lookup. Click on that to find your zone.
The plant that I said looked like one my mother had — the name is still on the tip of my tongue. She always wanted to start one for me but that was when I was moving every couple years and didn't feel like taking anything with me. Maybe my aunt might know if I can find another picture.
So you have mostly shade. I'm lucky if I can get 6 hours of sun. One year when my oaks lost their leaves kind of early, I was able to put in a bed with native perennials. They've done pretty well but some of them will start leaning like they're just trying to stretch a little further for more sun.
Grass. As I've previously said, I have a little of this and a little of that and when it's mowed it all looks green. If I find a picture that doesn't identify my house, I'll show you what I mean. But the mix of native grasses won't work for you. They need more sun. I'm still annoyed that the City flooded my parkway, the only spot with full sun. And I was all set to seed it with the mixed seed. Anyway, someone else will have to advise you about your 'grass'.
Never heard of petal blight. And yes, I do see a lot of azaleas. They're very pretty in the spring when they're in full bloom. If you have a fungus, I hope someone will hop on this thread and advise you.
Like you, I hadn't heard of canna leaf rollers. Just found them when I googled. Again, maybe someone will hop on any help you with that issue. I don't remember what the link I found said about them other than they weren't a good thing. Here's a link that's easy on the eyes and has 2 organic solutions. One is to find the caterpillars and hand pick 'em. The other organic solution is to use Bacillus thuringiensis. It's a good product but I can't tell you much more than that. Here's the link I was reading.
https://www.gardeningknowhow.c...
and another I just found
http://www.GardenSMART.com/?p=...
You're doing good by experimenting to see which of your plants are happier where they are or need to move. Same with water. Watching and making changes when needed is probably the best way to learn what each of your plants like. Good job!
