Harvest tile in Tzolk'in

[Bootania]

Hello everyone! I'm new to BGA, and I'm having a good time lerning a lot of new games here
Now I'm trying to learn Tzolk'in, and it seems like a really great game! Only, now I need corn. And when I choose my marker on the wheel where I can get corn, it says that I have to take a corn harves tile to get corn. But I cannot see a corn harvest tile anywhere, and I also don't know what it looks like. Can anyone give me a hint where to look/what to do?

[Bootania]

Never mind, I think I figured it out. There has to grow corn there, in order to harvest it. In my case it didn't.