Companion Planting.
Have you heard of this? Many gardeners believe that certain plants planted together help each other thrive, others, not so much.
The most famous companions are the "three sisters" from Native American folklore: Corn-squash-beans. All planted so their roots interact.
Here's the first article that comes up on a search:
https://www.thespruce.com/companion-plants-for-tomatoes-1403289
