That is a great photo and project. I am anxious to see if you are able to get good melons out of your potted ones. I've tried it before and what happened to me was that I got really nice, healthy looking plants like yours and they set well and the watermelons grew normally until they were a little bigger than a softball. Then everything just sort of froze. Plant lived the rest of the summer and melons stayed on and didn't rot, but also never got much larger and never ripened. So I am interested to see how yours do. PLEASE don't let my experience dissuade you in any way. For one thing, I know I had a poor dirt mixture in my pot. I also know that my pot was considerably smaller than yours. And finally, it was in the shade at least 3 hours of the day. SO in many ways mine never had a really good chance.
I will absolutely look you up on facebook, Drew. Your urban farm plot sounds wonderful to me. I may have told you this before, but the town near me that I used to work for had a little plot of land in the middle of town in sort of a rough area. The entire piece of land was probably about 1/2 an acre. They tilled it up and divided up into plots that were REALLY small- I'd guess no more than 15 feet by 18-20 feet. THey put up a board and put the number of each plot and the person or organization who was "farming" it. You wouldn't believe what wonderful, cute little gardens people made, I'd heard of such things in big cities, but I'd never seen one myself and didn't even know they were ever done in small towns (this town pop was about 9,000). It just had a profound impact on me. Really. Of all the public/private partnerships/projects I've ever seen, this one was far far and way my favorite. I didn't have a plot but was so interested that I ended up spending a LOT of time there just talking to people and looking at the gardens. What touched my heart even more than seeing how well the gardens looked and how proud people were of them was the makeup of people who did them. One was an old, old man who had farmed his whole life but now was too old to do much at all, but since they till the soil at the start and its such a small area, he was able to use just a hoe and plant and grow things and he just loved it so much. Every time I'd see him I would stop and get out, and he couldn't wait to show me his little plot and ask me if I was surprised how good it look (I actually was!). I just can't tell you the joy this old man got from that tiny little plot in the middle of a city block. Another plot I loved to visit was "farmed" by a young Hispanic woman and her 2 young children. She and I could speak each others language just barely enough to communicate but we could do that. What got me about her was that she was growing that little garden because she really needed the veggies, not because she necessarily loved to garden. She was constantly telling me how much something would cost if she had to buy it. She would pick up 2 tomatoes and say "Almost two dollars at grocery story just for this, but free for me now". She would sit her baby on a blanket and make her older child (7-8 yrs) pull weeds with her. It was a very touching site to see the family all working (dad wasn't in the picture). I could go on and on. I know I've already bored you and anyone else reading this to tears, but I thought you'd understand since you apparently do this kind of thing yourself. I hate to tell the end of this story......but after 5 years of success and stories like I've just described, the city sold the lot to a church that bordered the property and the church built a storage building on the site and neither the church or the city ever did urban gardening again!!! Made me furious. They have countless other programs that are useless and cost much more, yet they did away with the best one they ever had. Sadder still, there was no public outcry- likely because the people who need a program like that don't really know how to engage themselves in the political process (ie go to a City Council meeting as a group, tell stories and show photos of what it meant to them, etc). I had moved away by the time they closed it or I'd have become a Cesar Chavez of that one small town gardening group! Anyway, I hope you enjoy what you are doing as much as I enjoyed watching those folks and their little urban garden plots!