Depending on where you live, Meyers may or may not be grafted. I would not count on someone from Home Depot knowing the difference! That plant of yours may not be grafted, but rooted as a cutting.

A true dwarfing rootstock would most likely be Poncirus trifoliata or a citrange of some sort....all of which will exhibit trifoliate leaves, which I don’t see in your pic.

I agree, I couldn't trust what a HD employee know if it's grafted by looking at the plant, but the employee identified that the plant is grafted by looking in their system (which i certainly hope they looked at the right item...). So yes, I have doubt, but when I researched dwarf meyer lemon tree, people say for the Meyer Lemon tree to be label as dwarf, it pretty much have to be grafted on a dwarf root stock.

If this plant is a rooted as a cutting, is it possible that this plant to have a branch with very long thorns (last picture, right branch) and large leaves, and then very short thorns and smaller leaves on another branch?

Yes, sometimes a really vigorous shoot will have long thorns, even on a plant that has otherwise relatively short thorns. I can't see where that really vigorous, thorned shoot is coming from.

Also, I do not know what rootstocks are best for dwarfing Meyer. If maybe they used sour orange or rough lemon, it may be harder to see the leaf difference. If you can find out who the supplier is and try to contact them, that might help.

Or, if you have a really discerning palate, you could try crushing leaves from different parts of the plant and smelling or tasting to see if there is a difference.

Good luck!

I updated the photos of the trunk from all 4 sides into the original post.

As for the bar code on the pot, there is only the one from Home Depot (below). I went back to the store and see if there is that barcode on the other pots and unfortunately there wasn't in this shipment.

Just email them and ask what rootstock they use for your sku. The tree is from Durlings Nursery in Fallbrook, they should respond and let you know what it’s grafted to. I emailed Gless ranch once and asked them what they use for rootstock and they mailed me back with their entire color coding system for the rootstock and scion wood so I could verify what I had purchased.

It looks like your graft line is what I circled and everything on your tree appears to be growing from above the scion.

Evan

I'm not totally convinced that is a graft line. Either way, I think you're OK.

To call something 'dwarf' could mean two things.

1) it's grafted to a dwarfing rootstock, or

2) it is a naturally dwarf or smaller growing citrus variety compared to say, an orange. Meyer lemon does tend to be smaller than other lemons.