This garden is southern exposure with lots of sun and heat (usually 8am-3pm in the earlier summer months and then more like 8am-1pm in Aug/Sept as the angle of the sun moves over the house).
So I reconfigured my plan and with the checkerboard plan, each plant will have about 18x18 area for growth.
And if they get too big well then I'll just have to divide them and start another garden......