uh....the reproductive organs of a plant are what produce the seeds....in the case of most plants, morning glories included, this would be the flowers. i believe they make tiny seed pods, but i'm not too familiar with the anatomy of this plant. also, it has to be the right time of season, most likely. look it up...
well they are in seed pods, kind of little circular brown things, there is around 8-10 seeds in each pod. Of course it has to be the right time of the year for the vines to be producing seed.
i grew morning glory last summer. i had only one vine that really made it, and it grew up a wire-frame shelf i had outside my house, about 5 ft. i got a whole bunch of little brown pods, but not one seed. idk when the plant is supposed to seed, but this was late summer/early fall when the pods were falling off and the flowers weren't blooming anymore. i've heard that giving the plant way too much water can cause this, but i dont really think that was the case.
when i started growing i wasted two or three plants before i finally figured out how the seeds came. the flowers bloom and then they die and fall off. and then about a month or so later from where the flower fell off a little round green pod that is pointed at the tip and looks kind of like the flower buds comes out and then it turns brown as that little part of the vine dies and give it a few days after it dies and when its like that you pick it off break it open and it has four to six little seeds maybe a few more or less depending on how big the vine is. or at least that how my plant was.