@CircleAnA I am growing in my own garden. You'll need good soil to begin with or to fertilize the spot, elsewise you will not harvest a lot. organic fertilizer like manure you should incorporate some time before you transplant your plants into the spot or the roots might burn. if possible mulch the spot to keep moisture in and weeds out. tomatoes like sun, dry leaves and are thirsty af. corn needs wind for polination so you need to plant them in a block for good kernel development.

@CircleAnA if you plant corn + pumpkin or squash+beans or peas into one spot it is kind of a symbiotic layering. the pumpkin will suppress weeds on the ground, while the beans hold on to the corn. pumpkin and squash reroot from any part of the stem. if you cut of the lowest leaves and bury a tomato a little deeper the stem will take roots too, giving it a better base and increasing yield. plants producing big tomatoes need pruning so they do not shoot in every direction wasting energy on greens