A seedling has popped up in one of my planters (acid soil; Toronto, Ontario).
What is it?
June 4, 2020:
June 20, 2020:
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An extension of com.prehensible's comment -- your sapling could be a bur oak. It is older than the seedling pictured below, but retains a similar cotyledon. The range of this species includes Ontario.
bur oak seedling
Photo by Todd Dwyer, via Flickr
(please ignore the image artifact -- an effect of resizing)
Your photo appears to show the tree at a stage after the seedling shown above and before the more mature sapling shown here:
bur oak sapling
Photo by John T. Fowler, Alamy Stock Photo