Disappearing Pansy Mystery

 Now you see them...

 Now you don't...

Something has taken my pansies.
Not all of them.
But, all of them out of this log.
There were three plants.
Now there are none.
There is no sign of any of the three pansies anywhere.
There is no evidence that anything has been disturbed.
They are simply gone.
Does anyone have any ideas that might solve this mystery???