The crossword solution for the term 'Rhubarb with deep roots' is FEUD. Rhubarb is a perennial plant that is grown for its edible stalks and leaves. It has been cultivated for centuries and is native to Asia, Europe, and North America. The deep roots of rhubarb make it an ideal plant for growing in cold climates, as it can survive even the harshest winters. The term 'FEUD' is often used to describe a long-standing disagreement between two parties, which is similar to the deep roots of rhubarb.