The crossword solution for the term PARK SET-TO is RHUBARB, a seven letter word. RHUBARB is a vegetable that is often used in pies and other desserts. It is also known as a 'pie plant' because of its frequent use in baking. RHUBARB is a perennial plant that grows in many parts of the world, including Europe, Asia, and North America. The stalks of the plant are edible, while the leaves are toxic and should not be consumed.