put your far left middle sf by other sf on right side,put snap peas in front of far left sf ,swapplaces with zucchini n potatoes,reason being peas can climb sunflower as a trelis and zucchini is a vining plant so it can sprawl over corner of box on ground,one thought is how deep is your box for potatoes wiill it work in that shallow of a box?need 8-10 inches of soil for potatoes
make back row north side,just a thought have fun

Thank you so much for your input.

Is this what you're recommending?
Sunflower ===== tomato ===== tomato ===== sunflower
snappeas ===== spinach ===== carrot ====== onion
zucchini ====== basil ======= carrot ====== lettuce

I'm putting potato in its own deep (12-15") planter.
I've replaced it w/ another carrot.
Yup, the trellis side is North.

thanks bunches,
Amanda

that should work

The zucchini I have grown was a bush and needed it's own 4x4. So the North side is where? The side with the peas?