#1 looks like a seedling of a tulip tree AKA 'yellow poplar' (Liriodendron
This is a splendid tree, the tallest broadleaf trees in the eastern US. This one
is not a weed but rather a good plant out of place.
#2 may be a smartweed or knotweed (Polygonum sp.), with the emphasis on WEED.
Pat in Plymouth MI
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