From his following death haiku "Hechima Sakite Tanno tsumarishi Hotokekana", "Tann itto hechimano mizumo maniawazu", "Ototoino hechimano mizumo torazariki", the anniversary of his death memorial on September 19 is called "Hechima ki" or also called "Dassai ki " referenced from one of his pen names.
辞世の句「ヘチマ咲て痰のつまりし仏かな」「痰一斗糸瓜の水も間にあはず」「をとゝひのへちまの水も取らざりき」より、子規の忌日9月19日を「糸瓜忌」といい、雅号の一つから「獺祭（だっさい）忌」ともいう。