Originally posted by Lady Vine XIII:

I did not realize that those blocked spawns. Thank you so much. I will make this happen pronto in my crop fields. Do the Campfires need to be lit?

No. And if ground space is at a premium, standing torches also prevent spawns. They don't need to be lit either. However, if they are out in the open and not behind some sort of wall or other barrier, they can get knocked down.