Here's why:
* Common Noun: "Weeping Willow" is a common noun, referring to a type of tree. Common nouns are generally not capitalized unless they start a sentence.
* Proper Noun: If "Weeping Willow" is part of a specific name, like a park, a street, or a business, then you would capitalize it. For example: "The Weeping Willow Cafe" or "Weeping Willow Park."
Examples:
* Correct: "The weeping willow tree swayed gently in the breeze."
* Correct: "Weeping Willow Lane is known for its beautiful trees."
* Incorrect: "I saw a Weeping Willow Tree in the park."