Study the tags for key terms like "dwarf" or ask inside - if this is an independent garden center or other location where it can be expected staff on hand knows the plants being offered.

Look up "peach espalier" and "peach pruning" on the web to see about training them flat against surfaces, other relevant details - presented with illustrations. In general peach trees are small growing, of course 20 ft is small for a tree. But in my area for instance one 15 ft tall is a whopper. If, like here yours is not a prime climate region for these it may also be typical for most to not been seen even this tall.

This garden centre only mentions this:

Prunus persica 'Redhaven'

Plant Type: tree
Height: 20 feet
Spread: 25 feet
Sunlight: full sun

So my guess is it is not grafted, and it is full size (not a dwarf). I believe I can keep it under 7'-8', why not? Some people grow it as a bonsai indeed, without grafting to slow-growing rootstock.

Is this an actual garden center or instead a warehouse store plant department? An independent nursery should be able to answer your questions.

Its grafted, dont know of any peaches that arent. You can probably keep it to your size requirements by both summer and dormant season pruning. Very limited selection on "dwarfing" root stocks for peaches and most of them only do well in certain climates.

REVIEW:

I bought "Catherina" peach, at http://www.plantworld.net/ - promotion, 30% off

My decision points:

- with most fruits (they were flowering there one month ago); if it has a lot of fruits then it is good for Toronto (specifically for my area; because it was flowering one months ago, 5 min. drive)

- find with nice "framework" - so that little needed for shaping.

The best choice was Catherina Peach: same size as Redhaven, but twenty times more walnut-sized peaches. 20-30 peaches on Catherina, and 1-3 on competitors; same height, same number of branches.

GRAFTED: no, nothing grafted... very strange.

- find healthiest!

Last one, "healthiest", was really hard. I noticed one huge Catherina Peach with about 30 peaches on it almost bought it - but frame needed a lot of hard pruning, and at the soil level I noticed big walnut-sized piece of sap at first I thought it was rotted peach...

Anyway I bring mine home, and I washed out whatever hidden under soil, and here are my subjective (or so-so) observations:

1. Soil: three gallons rootball was very deeply planted in 15 gallon pot. I washed out almost all 'soil' which was pieced of wood chips (not bark!!!) mixed with some manure (of unknown origin: the next few days I had hundreds of small green flies at the area!!!)

- that was washed out from roots.

2. It was planted too deep: 5" deeper than needed. So that bark has a lot of weird holes in it, bacterial infection. And sap... too much. I washed it completely with high-pressure hose, and sprayed it (*heavily*) few times with Hydrogen Peroxide. Still some sap comes out, but stopped on third day:

Note that there is no graft here. About 6" cutting, and main branch goes under angle to it. It was completely hidden under 'bad' soil (producing green flies!) at the retail store for about two months.

3. Replanted tree. Trying to establish roots properly, and it will straighten itself:

It had 6(!!!) tags on it, and fortunately one contained nursery name:

Catherina

Bailey 11/16"

Mori Essex Nurseries Inc., 905.228.6917

No idea what 11/16" means... not grafted.

Note: I washed out 99% of soil it came with, and planted into my soil (which is almost pure sand, with zero additions). Picture taken on third day, tree is looking happy.

Be careful with those nurseries! I had extremely opposite experience with mail orders from https://www.whiffletreefarmandnursery.ca/ - very healthy bare-roots, grafted, exact species names of stock and scion, booklet (how to plant it), and so on.

Thank you!

UPDATE: It is grafted. I found that "Bailey" is name of rootstock. Some nurseries advocate to plant with graft union 2" below surface, but I want it to look beautifully "ornamental" with roots going outward at the surface level. And as you can see, I was right: "Bailey" was going to die, I tried to save it.

11/16" on the tag probably means trunk diameter of the rootstock.

Quote:

Bailey:

An old peach cultivar released from West Branch, Iowa. For several decades this rootstock has been the most predominant rootstock used in the Ontario peach fruit industry. The Bailey rootstock is very a reliable, cold hardy rootstock that produces uniform trees that are medium to large in size with reliable yields and good yield efficiency. It is compatible with most of the scion cultivars grown Ontario.

http://www.omafra.gov.on.ca/english/crops/hort/news/tenderfr/tf1705a1.htm