I have 4 4x4 raised garden beds. Any recommendations/tips to get the most out of small space? In the past I have planted: green beans, cucumber, zucchini, squash, watermelon, spinach, lettuce, snap Peas, jalapeno, bell peppers, cherry tomatoes, and carrots. I am open to any help to Maximize my space and get the most bang for my back. Thanks in advance!