Now I'm confused! I thought the seeds distribute when there aren't enough of them because they are finite. You're saying hoarding causes seeds to be distributed? I thought seeds have to be used for more to come.

Otherwise it would have untenable implications for the game. Let's suppose planting and harvesting seeds doesn't cause new seeds to be distributed. If that were the case, the game would run out of seeds. They would all get planted and harvested, no new seeds would come, and the game would end.