On the contrary, camellia is not favored because all the camellia flower petals falling at once is compared to a 'fallen head,' and associated with beheading of a criminal.
逆に、ツバキの花は花びら全てが一気に落ちるのを「首が落ちる」ことに例えられ、罪人の斬首を想像させて喜ばれない。