Increase chance to get a seed when harvesting crops.

[Riamus]

I do sober up when I remember plants grow to maturity in 2 days, because if I had to wait 60-100 days for corn to mature then I'd need a whole lot more farm plots, plus harvesting and replanting would take forever.

That in itself can be considered part of what is happening with seeds.  If you were to assume you got more seeds and planted them and harvested then in a few months, this is just a way to allow "early harvesting" of some seeds, but not all.  If you replant for a few months straight, you'd probably end up with the same results as a single planting that you had to wait a few months for, but where you could get many more seeds each planting.