Hi K,
Sometimes a plant will create a "proliferation" from a bract like the one you highlight. That's like a baby plant that can be nurtured and grown into a whole new plant. I have so much Stella I wouldn't wait around to see if a prolif develops, but you can if you want. Generally the scape will tell you when it's done. You can wait for it to turn yellow or brown. If something is going on at that bract, the scape will stay green below it. And if you want to see what happens, you can leave it be until the scape turns yellow and brown below it.
Tim