What does the other shore flower mean?

The Japanese alias of banyan flower is called "Manzhu Shahua", which comes from

The reason why the flower on the other side is widely spread in Japan is that it blooms during the Japanese solar term "the other side (autumnal equinox)", which is the time for the Japanese to go to the grave. There is also a legend that eating by mistake will kill you, that is, "going to the other side." Legend has it that it is a flower that grows near Naihe Bridge. The fragrance of flowers has magic power, which can arouse the memory of the deceased before his death. Because it is poisonous, Japanese farmers often plant it beside farmland to prevent animals such as mice from destroying crops. For the safety of children, it is often planted around the cemetery. So it is also called "dead flower", "ghost flower" and "hell flower".