Yes on all counts only I'm in a zone 2 zones colder than I'm used to.
Never had a problem with growing anything down south. The only pests I had were tomato hornworms & fire ants.
Here I'm having problems growing just about everything except pole beans
I got maybe 6 cukes this year before some disease totaled my plants. Nothing from my Armenian cukes which actually disappeared as did all melons.
Cabbage worms are horrendous here. Japanese Beatles were attacking my beans before they decided they liked my cherry tree better
Septoria leaf spot on my tomato plants
So far pumpkins & acorn squash are the only things the squash bugs haven't killed, well, the zucchini I have in a pot hasn't been attacked by anything yet but it's not producing either.
No rain to speak of from May through August but we're getting pummeled with rain the few times it has rained in August. Temps have been all over the place. Some nights of 54 degrees & days at 84, just a week before it was in the upper 90's.
I do have tons of tomatoes on my plants but have been having to remove leaves daily. If it weren't for the pole beans the tomatoes wouldn't have much protection from the sun.
So yes. It has been difficult here this year but I'm dealing with it & learning how to deal with it. Like row covers which I've never had to use before & planting cole crops in fall & not in spring.
Sunflowers are doing well