The term 'very tall tree' can be summarized by the crossword solution of 'REDWOOD'. Redwoods are a species of evergreen coniferous trees that are native to the coastal regions of the western United States and Canada. They are the tallest trees in the world, with some reaching heights of over 300 feet. Redwoods are also among the oldest living organisms on Earth, with some specimens estimated to be over 2, 000 years old.