No idea!?
It seems to get two heads!?

Hi Tim,
your Yucca rostrata had an injury in the meristem
was born in last winter. Animated by the damage in
originating inside, your Yucca would form a new head.
Sometimes, however, the damage grows out again
and you get two heads. However, only sets
by a sprinkle generously cinnamon in the growth of opening,
this will help to disinfect and stop the rot.

kind regards
Sascha Svatek