Upon More Careful Observation

Mystery is never absent--lower right.

The planter is spent.  After a whole summer and a good chunk of fall, plenty of which had a record lack of moisture, anything that has survived in this tired pot of plants is indeed a hero.  The idea of checking out the faithful arrangement of growies drifted through the Things I get to do today, and I finally detoured while headed to the chicken house to at least tip the plant container to drain out the gatherings of our lately heavy rains.

Big Green will come out someday and will be a. . .

And I moved the whole arrangement to an area that would collect less water. That's when I noticed a bright green spot in an unusual place. Ajuga trails over the edge.  It has purple flowers.  What is this chartreuse bud going to flower into on the Ajuga? More careful observation: big green is not technically part of the plant; big green is a chrysalis. 

Mystery.  Suggestions?  Can anyone tell me what this will be?