It happens to all of us. ; ) Thank you so much for the stash of acorns! I'll be sure to get through the rest of winter now. LOL!
If the timing & selection of weedy plants that like to hang out together, where your pic was taken, is similar to where I am, that little yellow thing is probably black medic, which comes up very early & seems like it's going to take over but then disappears after the first couple hot days.
Black Medic (Medicago lupulina)
