BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on June 9, 2020
It is very hard to say. I can't quite make out the details of the photos. It is very likely that it is from the trees nearby. Usually, you can catch these in early spring before they fall to see where they come from.
There will be no safe way to prevent them.
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