The second-to-last day of this month is devoted to any UPG that I might have about Haides. Interestingly enough, I have the strong feeling that Haides is not only the Lord of the Underworld, but also one of the Theoi that is strongly associated with farming.
This is because Haides is lord of the wealth of the earth. When you plant a seed in the earth it is transformed into the plant that will later produce food for mankind. Also, the act of the harvest itself often kills the plant — such as the harvest of grains or root vegetables. This would make the marriage of Haides and Persephone much more explainable in ancient times.