YES! YES! YES! And I cannot recommend it highly enough!!! I had more fun with those square watermelons than almost anything I’ve grown.,…and here is why: I would show them to people and tell them it was a new GMO watermelon that they had genetically modified to be square so that they could be better packed and shipped! It was priceless watching people’s reactions and seeing them pick them up and examine them and marvel at how amazing it was that people had created a watermelon that grew square. SOOOO funny. When I’d finally tell them they always enjoyed the humor in it, and were still fascinated by the results.
I actually built my own molds. I did several versions- some worked some didn’t. One if the easiest was one of those “real” plastic Milk crates you see behind grocery stores (no, I didn’t steal one from there!! ) The cheap version they sell in Wal-Mart for dorm-rooms and so on aren’t near strong enough, but the real ones are. I tried without a lid and it sort of messed it up since the top was still rounded. I also learned to put wood boards on all 4 sides inside, otherwise the melons sort of spread into the spaces/shapes of the side of the milk crates which have opening/designs.
I also built some out of plexiglass. I just went to Lowes and had them cut me 6 squared. I formed a box originally using a drill and wiring the 6 pies together. It wasn’t strong enough…the Plexiglas eventually cracked and wires pulled apart. Next I bought really thick plexiglass and used hinges and screws and it worked pretty good. But it was a lot of work and I doubt you’d be interested in doing all that.
eventually I used an oild but thick and strong metal tool box and some other old metal box I happened to find somewhere and it worked.
If you find a place that sells the, I’d do that. None of my methods were that great. I made them work but I was constantly reinforcing them and adjusting them and so on. But the important thing I want you to take from my \post is just that if done right, it absolutely DOES WORK and is amazing and can be quite fun- as I described above. I wish you luck!