Kind of a late response, but when you pick acorns you can dump them in water, the floaters are no good. A quick visual inspection of the sinkers is useful as some sink but clearly have too much damage to be viable.
Gardening in Montreal (indoors, urban, 6b) and the Laurentians (sandy to sandy loam, boreal forest, 4a)
girl power ... turns out to be about a hundred watts. But they seriously don't like being connected to the grid. Tiny ad: