I just looked at the my fruiting Cocktail (madalo) grapefruit tree, it has a few fruits on it now. That tree has large thorn abot 2-3" when it has new growth. So before I can get to my fruits (12 ft high), I will take my clippers and cut off all the thorns on that branch so I don't get stab with them. These thorns are not little ones, but giant thorns.