After all, what exactly is the cause?
An ordinary seed being raised in an ordinary way becoming a monster.
Is it possible that something like that could have happened?
In the seeds that Aisha received, by chance had a Treant seed mixed in, that much I can grasp.
Treant are able to mimic their surroundings.
So by that process, it might not have been suspicious to choose the form of the Bacillus flower.
While I consider all of that, only one result remains coherent.