I tried the North American  thing of the three sisters - corn, climbing beans and squash.  Didn't work for me 

    The beans tried to climb the corn but just ended up strangling the emerging cobs, and I couldn't get to anything because there were giant squash leaves everywhere.   I tried dwarf beans which did better but were overwhelmed by the squash before they could  produce beans.
I had to put in canes to support the climbing beans and the corn.  The squash did quite like it.  Now I give everything it's own space.
This was all in the polytunnel as none of those crops would grow outdoors where we live  
 
  Inside the tunnel I always have to hand pollinate squashes and courgettes even though there are often plenty of bees and insects.