plants for birthdays

My former boss is celebrating his birthday soon. I know that he was quite disappointed when I resigned. He was the best mentor I ever had. It would be nice to give him some plants for birthdays. He loves putting plants in his office. I hope I can give him a nice plant that he can put in his office also. He's good with plants so there's no doubt that the plant would not die soon. I wonder where he can place the plant that I'll be giving him. He has like a mini garden in his office already.