"Have a tree" is commonly used to refer to the act of owning or possessing a tree. However, there are various synonyms that can be used to replace the phrase. Some alternatives to "have a tree" include "own a tree," "possess a tree," "have possession of a tree," "acquire a tree," or "be in possession of a tree." These synonyms can help to add variety and depth to your writing, and make it sound more professional. Whether you're writing about nature, gardening, or simply describing your surroundings, having a range of synonyms at your disposal can be incredibly useful.