六日の菖蒲、六日のあやめ
むいかのあやめ
muikanoayame
JMdict entry #2851445
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expressions (phrases, clauses, etc.)noun (common) (futsuumeishi)
idiomatic expression
something that comes too late to be useful; iris (blooming) on the 6th (i.e. one day too late for the Boy's Day celebration)
see: 端午の節句