Using the GUI Store Manager tab to do anything to reprice or remove one's fire flowers gives no changes made. Using the `shop` command similarly fails, saying there are no fire flowers there.
(I'm guessing this is related to the fact that there are two items in the game named "fire flower": the hot damage potion and the Path of the Plumber quest item.)
> ash $item[fire flower]
Multiple matches for "fire flower"; using "[10462]fire flower". (char 7 to char 18) Clarify by using one of:
$item[[2426]fire flower]
$item[[10462]fire flower]
You should try using the item # in your request instead of the item name, given the ambiguity of "fire flower"