What it really comes down to is if you want seeds or you want to try propagating the plant from the flower stalk.

If you choose to cut the flower stalk, just stick it in the ground upright. I've had good success with that this year with a 100% strike rate. I tried cutting up the stalk into 1 inch pieces and laying them flat on the soil and putting a bit of soil over them. Out of about 8 pieces, only one struck.