Tall grass is a type of vegetation that can be found in many different climates and environments. The two crossword solutions for the term tall grass are REED, which is a four letter word, and BROME, which is a five letter word. REED is a type of tall grass that grows in wetlands and is often used to make paper, musical instruments, and other items. BROME is a type of tall grass that is native to Europe and Asia and is commonly used for animal feed and as a soil cover.