I don't think Hardings seng could be certified organic.
He told me that he did not know of anyone that was actually selling seng certified as organic and he did not think you could actually successfully grow seng without spraying chemicals.
He told me he sprays Captan pre-emergance and then sprayed with other chemical protectants regularly (in spring after each significant rain) and best I remember he mentioned Maneb as one of those.
After talking to Larry I was sort of down a bit, because he basically told me that you could not grow seng without spraying chemicals to control the diseases.
But now Larry also told me he did not do soil test, did not check calcium levels, did not add gypsum, he did not know what the PH of his soil was and that he plants it thick and makes use of all available space.
Who knows his place may not have calcium or phosphorus levels high enough, or PH low enough to grow healthy seng without disease problems, especially at the seeding rate he uses and with large beds, densly populated.
I was sure tempted to go out and buy some captan and spray my beds after talking to him but decided against that.
If I do spray anything on my seng beds - I have made up my mind that it will be something certified organic.
I know for sure that organic methods work and work well if used properly. For example I never use chemical fertilizers or pesticides on my garden and I grow excellent healthy garden plants each year, corn, tomatoes, squash, onions, lettuce, peas, okra, etc and use nothing but my own compost, bone meal, blood meal, epson salt and proper plant spacing.
Giving the plants enough room is very important to their overall health.
When you plant too close and they get crouded that brings on stress and when plants get stressed then all kinds of other problems come on, insect pets and other diseases attack.
Hey I looked around online this morning and found an nice Homeowner Fungicide Guide and it list both chemical (Captan, Maneb, many others) and Organic options too and also mentions pesticide options too.