Q.When Does An Orange Tree Start To Produce Blossom?
Some years ago – I can’t remember how long, maybe six years or so – a friend gave me a small pot plant standing about six inches high, and told me it was an orange tree. I’ve kept it in a pot indoors and it is now over three feet high. It grows new leaves (and lots of thorns!) but has never blossomed. Is that likely to ever happen?

Certified GKH Gardening Expert
If it does flower, it can be up to 15 years before you see them, unfortunately. You can shorten this time if you purchase a grafted specimen then this can be much shorter.
I would be sure to pot it up on occasion.
https://www.gardeningknowhow.com/edible/fruits/oranges/orange-tree-container-care.htm

Thank you for answering, BushDoctor. I didn’t realise it could take that long! Obviously need to be patient.