prickly pear wont flower

Hi All,
I have a large prickly pear in my backyard planted in soil that's at least six years old. It is tall at least a metre and a half taller than me,but i have never seen it flower or fruit,is there a way to promote flowering i have read getting a fertilizer with no nitrogen only phosphorus and potasium.I am unable to find any locally on the gold coast in queensland.

Welcome.

Do you know what species it is? I am no expert on Opuntia but knowing species should help with special care to promote flowering.

Hi Cereoid,
I do not know the species as i got the cactus from a friend who moved into a house and didn't want it. my uncle has a prickly pear that produces fruit but the leaves are much bigger than mine.

Can you post some pictures?