Thats why I said averaging. Go look at any female that size and count the ridges.Even my seedlings have min 11 ridges. It could even be a superstition for all I know. Or maybe observation, but I read that info online and have been using it. Thats all I am saying. Hope that clears up what I said. And the question I asked how old is the plant, was unrelated to the ridges statement.