You can only plant one plant at the top of the big tree each time! If you want to replace it with another plant, you must delete the current one being planted. To delete a plant, please follow these steps:

1. Click on the "Clothing icon" in the top right corner of the main screen.
2. Click on the "Plants" tab.
3. Find and click on the "Shovel icon" at the bottom right of the screen.
4. Click "Confirm Delete."
5. Choose a new plant. Don't worry, your past drinking records will not be removed by deleting a plant. Feel free to delete and choose a new one.