I have a Korean Giant tree, now about three yrs old. I know some pears have kinda thorns on them, but this tree is full of pointed protrusions! Is that common for those tree? Makes it difficult to prune. Almost as bad as a darn Locust tree!
Mine doesn't have thorns. Maybe your KG scion died and what you're left with is a rootstock. That's the only reason I can think of that your tree would have thorns.
Sorry to say but FN is right. I have 13 Asian pears and none had thorn. I did grow some seedling for rootstocks that had some thorn though. The best you can do now is to graft a bunch of different varieties to your tree.
This post was edited by tonytran on Sat, Apr 26, 14 at 12:43