Very cute!
Unless I am seeing the scale wrong though, you're going to have some very crowded plants. The problem with that is that you'll probably have issues with rust and earwigs.
Oh hmm, the insert said 8-12" inches apart and with the 4x3 setup it should be 8" for the columns and 12" for the rows. I'll have to see how these go and can always adjust for next year!
Haha, yeah, those inserts... In my backyard experience with corn I ended up needing about 2 feet between plants. They get big and can easily have a 10-12" radius of leaves. Maybe thats what they truly mean by 8-12"? It's okay and you have the right idea to try it and adjust each year.
So I have 18 seedlings right now and was going to get another six, so I could have 12 in each mini-plot. Do you think it would be better to move the first plot around a bit and have two sets of 3x3?