Any time a 3' space opens up in mine I stick another tomato or pepper plant in it. Picked the last of the romaine lettuce row today as it was starting to bolt and replaced it with 3 tomato and 3 pepper plants.

But you could do some bunching onions, 6 okra, honeydew melon, some baby carrots maybe, or even a 3' square of lettuce if you can rig some shade for it.

Dave

definately plant some corn or sunflowers then climbing beans and squash at the base.

In Zone 6, in June, when a space opens up I plant collard or Fall broccoli. Later I will go lacinato, then kale and fava, then bok choi, then arugula and rapini. The summer stuff is planted, our season is short. Go with Fall stuff.