Maple tree with root shank?

Abigail Krikke
last month
last modified: last month

Yesterday I had a maple tree delivered from a local tree nursery that was b&b in clay. We removed the burlap and removed clay down to what I believe is the root flare and planted it. There are 3 larger lateral roots here. There were some thin roots that we pruned because they were above the root flare and the resulting soil level. On the trunk is also a small scar from where I believe the tree was "cut back" by the nursery to promote growth and a straight trunk.

After some research I am concerned I did not plant the tree deep enough because it looks like the root shank is above the soil. Is this OK? I think there is a possibility the trunk adapted to being planted too deep at the nursery and transitioned to root tissue.

Thank you in advance!

My tree:

Image below from Link

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