I have a couple of peach trees that I planted about 45 days ago and they look like they are dying. I used organic soil. What can I use to boost their system and salvage the trees?

Are these newly grafted, or purchased from a nursery?

Peaches are tough to grow without alot of spraying. At least in the Pacific Northwest. I had two young peach trees die over this last winter, and it wasn't a severe winter at all. I spray every year with lime sulfur for peach leaf curl and that works great. But these two trees just failed to wake up this year. Oh well... I really could use another couple of apple trees.