We didn't really have problems with the corn outcompeting. At least in our zone (7B/8A) as long as you're properly succession planting them (Corn first, then b

We didn't really have problems with the corn outcompeting. At least in our zone (7B/8A) as long as you're properly succession planting them (Corn first, then beans, then squash, each delayed a few weeks after the other) they tend to grow well. The corn stalks were going dry around the time the beans were popping off, and the beans were slowing down around the time the squash really wanted the light. Admittedly - we used smaller varieties than you for the squash (heritage summer squash) so maybe the melons need more. Our biggest issues was just that you need a LOT of corn to get the correct pollination. 10 plants absolutely did not cut it. We needed at least 30 in our space, or the ears were half empty. --- To be honest - it's probably still not as productive as partitioning each out and then carefully cultivating them. But it is super low maintenance once you get the hang of it. Nice for a family with young kids & jobs who are gardening on the side.