Thorny Question

Hi! @ eight years ago, we bought a "Mickey's Mini Orange Tree" at Disney World. Started in a pot @ 9" tall, grown inside until about a year ago and now thrives in our yard.
Question: Unlike those we''ve seen at Home Depot and Lowe's, it has thorns. Is this unique or is it normal? PS It has never flowered nor has it had any signs of fruit.
As always, many thanks.
q thorny question, gardening
q thorny question, gardening
  33 answers