judging by you layout you have not read the square foot book or the spacing guides.

Wow, yes I have read the book several times a few years back. I'm generally following an intensive planting scheme, so it's not exactly "square foot" gardening but I thought this was the most apt forum. I feel like my soil is in great shape now and can handle this type of layout.

Nonetheless, I've made quite a few changes since this post, based on feedback from other (facebook) gardening groups. A few noteable changes - I've dropped the corn altogether and moving some of the herbs (purple coneflower, calendula, lemon balm, chamomile) to a herb-dedicated bed nearby.