As an aside, we use a hint suggested by someone else here on BGG. During the end of year clean up we put the clear grape/wine tokens on our fields. Whenever we harvest we move those tokens down to our grape pads. This way we can remember which fields have already been harvested that year.
But God shows his love for us in that while we were still sinners, Christ died for us.
In your world, I have another name. You must learn to know me by it. That was the very reason why you were brought to Narnia, that by knowing me here for a little, you may know me better there.
There is one exception that I know of--the "grape thief" visitor card. It allows you to harvest someone else's field as if it were your own. The owner may still harvest that field in the same year as well.