The tomatos and peppers probably, because they like a deep bed but have fairly weak roots.

Okra has a humongous root system, but it's capable of going as deep as it needs because the roots are very vigorous. So it can use the shallow bed.

Summer squash have fairly shallow root systems - give them the shallow bed.

Plant herbs too - basil would love the area, as would oregano, sage and thyme.

Wow, thanks so much for the good advice!. I would not have guessed that the squash have relatively shallow root systems. Tomatoes and peppers shall get the royal treatment then. Ha - I will be able to bury those stems vertically!!!

Since the bed is deep with plenty of root space, I may try to cheat on the sfg spacing rules and sneak in an extra tomato, and encouraging it to trail over the side..

I'll definitely sneak a dill in somewhere! I have parsley, thymes, sages, rosemary and sweet bay growing elsewhere. I've 3 earthboxes to replant next, thanks for reminding me that one should be filled with basil!

If okra is such a vigorous root-space-hog, it may need to just fend for itself! Perhaps I should try amending the native soil downslope from the planter boxes and it can suck up any moisture that moves its way. We just had a deep rain (thank goodness) so the clay is very easy to work today. Hmmm....

The 2 cu yards of planters mix more than filled all 64 cu ft of planting bed space, though I know it will settle a bunch. They are full to the absolute brim, and the settling will be made up with mulch.

But, there's still enough to fill two 1x7 planter boxes. I'm going to put them right between the fence posts, there is no fence up now but I'll be putting up 2x4 welded wire, 5 ft tall. So eventually about 50 ft of back fence will really be a trellis.