Cyndi:

You're not providing us with much context to try to give you useful advice, and maybe that's why folks are not jumping on your post.

Pretty much all peach trees are grafted, using various types of rootstock. The alternative would be a seedling peach, which might not faithfully reproduce the original variety, and would grow very large. So the question with respect to your peach tree is: Is the rootstock which is called "dwarfing" on the tree you are considering appropriate to your climate and the growing conditions you will provide? The truly dwarfing peach rootstocks, intended for trees which can be containerized, are much more cold sensitive than the rootstock types which may be called "semi-dwarfing", but will grow a larger, tougher tree.

So please tell us the source of the tree you are considering, and whether the seller is able to provide reliable information on the rootstock type and its hardiness in your zone. There is no question that Reliance is one of the most hardy peach varieties so that takes care of the top part. It's the bottom part that is in question. It would also be important if you intend to try to grow such a tree in a container, which would make winter protection necessary in the Denver area.

If you are buying from a local source, the nursery people should be able to give you the information you need to make an informed decision. If from a mailorder or online source, tell us which one, and how they describe the rootstock and its hardiness in your conditions.

Don Yellman, Great Falls, VA