Since Johnny's Selected Seeds calls their Vitamin Green "Brassica rapa (Narinosa group)". I don't THINK it can be related to Horenzo.
I never heard of Horenzo before you introduced me to it, but searching around online, 1-2 places call it "Japanese Spinach".
My older PAPER copy of the Kitazawa catalog seems to say that "Horenzo" is the Japanese word for "spinach", so presumably it is "Spinacia oleracea", or at least "Spinacia" and not a Brassica.
http://www.kitazawaseed.com/se...
Akarenso, Hybrid #306
Alrite, Hybrid #038
Okame, Hybrid #123
Samba, Hybrid #301
You might wnat to try this: Tainong also has what they call "Oriental Spinach". My notes say "Hybrid", so he either told me that on the phone, or I guessed.
On the phone, he assured me it was a local variety of "regular spinach", with arrowhead-shaped leaves and some heat tolerance. "Large upright plant with long tender stems. Big, slightly pointed leaves. Dark green color. Strong against Mosaic and Downy mildew. Heat tolerant variety."
