Perhaps, one of the oldest plant communities that we know of is the
Three Sisters, beans, corn and squash. It is a First Nations planting
method that goes back for several centuries and is often associated
with the Iroquois.

Now corn is not often a crop that a
backyard gardener, unless the backyard is a good size will plant but it
can be a great community garden crop and the sisters can make an
excellent shared garden within a community garden.

However, if you have the space or simply want to experiment then the 3 sisters will increase your yield and reduce your labour.  more

The 3 sister, photo courtesty flickr/Abri_Beluga