I’ve been growing zucchini vertically for years in my square foot garden. All vining crops are grown on trellises to save room, and to also provide better air circulation and sunlight. You know that zucchini leaves can get very large. As long as you have things that can get some sunlight you can use those larger leaves as a shade cover to cool down the soil for crops that don’t normally like the extreme temperatures we get. I’m able to get good morning sun on this lettuce, and then the larger leaves shade it for the hottest part of the afternoon, Combined with 3 or 4 other tricks, you can grow lettuce all summer long no matter where you live. We have temperatures in the high 90’s and even low 100’s every year. My ebook is right over there on the blog if you want to learn more about growing lettuce in the hot summer months.