I suspect「根も葉も火種も」 is an allusion to something I do not recognize. To what does it refer?
Consider this couplet from an amusing song released in March by IOSYS called 「ステマの女」(CD and promotional Flash animation, that can be found on YouTube or NND):
根も葉もない is an idiom that means "unfounded rumor".
How did it come to have this meaning from 根 and 葉?
What does the addition of 火種 and the change from ない to ありゃしない do to the idiom?