looks like a seedpod, that thing is a pregnant calyx, it will produce 1 seed. I had a plant do this to itself after it grew 1 pollen sack(deep in a bud), never spread outside that one bud, but it produced some 10 seedpods. I am pretty sure you can produce more than enough seed from a single plant, probably upwards of 300 seeds or more per plant.... that is if thats what you want....