did you edit any thing in the script ?
the default setting...the flower is spawn at the below part of center of prontera...
for( set .@x,153; .@x <= 159; set .@x,.@x + 1 )
for( set .@y,146; .@y <= 153; set .@y,.@y + 1 ){
start from Coordinate 153,146 until 159,153 .....
if you have moved the npc to other map..then make sure the coordination is accessable...
and ...this flower event..is not an auto event...it required GM Staffs to start the event manually.