Maya,
I used Paraquat for years, but it became a restricted use Weed Killer and I switched to Round Up. I did a spray last Fall to prepare for planting ginseng and it lasted all summer this year because the summer was so dry and hot. I just spray in the rows and mow the centers with a zero turn mower.
Maya, you need to buy a Contender Peach Tree. It will do as good as the Reliance up there and it has great peaches. If it gets down to -25 or 30 below I don't know if it will make it or not.
TN, thanks for the comment on the color of the peach. I love that deep scarlet color. It sounds like the rest of the summer will be busy for you.
Hugh