The answer is any plant that’s not a tree, bush, or root vegetable. That leaves lots of options! Yes, you can grow melons, pumpkins, squash, tomatoes, peppers, celery, cucumbers, eggplant, beans, peas, Swiss chard, kale, collard greens, lettuce, bok choy, broccoli, brussel sprouts, and kohlrabi – to name a few. This photo album of our Towers and produce grown via this easy gardening method shows the abundance it produces, Our Productive Tower Gardens.
This document on Seeds, Seedlings, and Planting includes a list that will give you lots more ideas.
Enjoy growing a large variety of nutrient-dense and tremendously tasty produce in your Tower!
Questions? Contact me at firstname.lastname@example.org.