I put a few cuttings of a Portulaca in this combo tender succulent pot two years ago. I do bring the tender sucs in for the winter. It did not come back last year. I wonder if this looks like a Portulaca to you experts, It is possible that it is one of my tender succulents that I forgot I had planted in this pot.
But I thought it was strange that if it was a Portulaca that it took 2 yrs to come back and bloom.