I've used the method. Didn't like it. We have very hot, very humid conditions June through August, and fight septoria every year. Yes, we rotate tomatoes each year, and go two years before using the same spot or soil.
In my climate, the tomatoes in the Japanese tomato ring are too close together. I have more success with planting in a single line, two to three feet apart, and pruning bottom leaves up to point where the first fruit sets on. I never have leaves below about 1-2 feet on bottom of vine, which helps with air flow.
In the Japanese tomato ring, it creates an even more humid area in the middle of the ring, surrounded by the tomatoes, and around here almost guarantees septoria will set in. Tried experimenting with a couple for two years, and quit.
The same ring I use at times for growing a potato tower. Worked well, and took up much less real estate to grow fingerling potatoes.
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Now I fight cucumber wilt instead. Don't quite have that one perfected yet, but I'm gunning for it next year.
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PS Is this the thread where I said I'd come up with the name of the heirloom seed company I buy from? I guess if not, won't hurt anyway...
About us
Baker Creek Heirloom Seeds. They have a great place to go visit as well, and a fall festival, if you're in the area. All unfortunately closed for now other than seed shipping due to the damned Covid19.