New to the forum, had trees for many years but still class myself as a novice-intermediate.
I transferred a bougainvillea vine that was growing over a 6ft fence to a pot that i'm very happy now and this transformation i did over a few years. I was told that with regularly keeping the follage back (as we do with Bonsai) that the thorns wouldn't grow however mine still are. Any idea's or tips on how i can stop this?
The exact species i'm not sure of, the flowers are pink.
thanks for any help

Daniel