Plant work together to help each other survive. This is an awesome fact. They help repel bug and feed each other. This type of thinking goes back to the American Indians. They would use the Three Sister- which is where they would plant corn, beans, and squash together. I did this last year and it was first year I got corn!
Other thing that work good together;
Sunflower and peas
Strawberries and borage
Peas and carrots
Tomato and basil
Grapes and hypos
There are many more things too, what are you favorite thing to plant together?