According to internet research, the full moon is called Harvest Moon because many fruits and vegetables tend to ripen in late summer and early fall in the Northern Hemisphere. In the days before electricity, the farmer relied on moons light to harvest crops.
Another word I found was "full moon corn".
That song "Shine On, Shine On Harvest Moon" makes so much more sense now.
Shine on, shine on harvest moon up in the sky
I ain't had no lovin since Jan, Feb, June or July
Snow time ain't no time
to stay outdoors and spoon
So shine on shine on
Harvest moon for me and my gal.
Linking with BLUE MONDAY