This commercial grower in Japan posted this pic to his fb feed. Called the variety a trade secret. 50k-100k SHU Chinense. From the post it appears this is cold hardy. Any ideas what it could be?
It doesn't seem that cold in the pic. Ask if you can buy a few seeds.
Be careful mixing things with plum tomatoes HP. Mixing douglahs with dates was funny at first, then I got the short end of the stick. I ate a date, I mean. Douglah isn't disgusting.