When somebody say's ' You're my bamboo" it means that you're the sweetest and you make their life sweet just by being you. You make them a lot happier than you think; They love you so much. You make them comfortable and feel safe.
You literally light up their life.
Girl : "You're my bamboo, i love you <3"
When somebody calls you that or say that they are your Raddish, it means that they love you and you mean a lot to them and that they want to be the love of your life.
girl : "I am your Raddish "
Boy : "I am your Raddish , I love you so much ."