I used cement wall tiles to section my garden, they have 2 hollow holes in them. One day on a whim, I filled these holes with potting mix and planted daikon seedling in them and all of them grew fat, this was the 6-inch type.Ever since I started thinking about growing daikon I was wondering if they could be grown in sections of PVC pipe. Today I searched on YouTube and found this interesting video. I might give it a try if I can scrounge up some pipe.
I have grown the long daikon in fabric bags recently, and I picked them young when they were fat enough to preserve. I usually get tired of eating them, so I didn't wait for them to get to 12 inches.
I prefer growing the 6-inch type, since they have a shorter harvest time.