Out of curiosity -- how much does it matter whether seeds are organic or not? I mean, yeah, I think it matters for sprouting seeds since you're going to eat what comes out of the seed almost immediately, MAYBE some herbs, like the OP's asking about, since one might start harvesting leaves rather soon after growth, but other edibles that you're going to harvest after they are fully mature? Ah! Genetically modified selections? (would they be called
selections?) would NOT qualify as organic, right? So that would be one way to avoid them.
While I ask this, I HAVE chosen organic garlic bulbs/cloves and seed potatoes over not organic in the past....
Oh, so as not to hi-jack this thread -- I don't think mint and coriander really need fertilizing. Other than the random compost that falls on or near them while taking care of flowers in the same area, I don't add anything. Oh, I do let vetch grow in the same bed (nitrogen fixer), then pull them up and use them for mulch. "green cillies" -- did you mean "green chillies" -- are you talking about the spicy ones or not spicy ones -- i.e. green peppers? Oh well, I'll leave this to the more experienced folks, but I would think they like extra potassium -- I usually use greensand with my compost. I believe banana peels and veggie scraps add extra potassium to the compost too. You might want to ask this in the vegetable gardening forum -- I bet there are some SERIOUS hot green chillie experts over there.