For a 6 foot Christmas tree, it's recommended to have around 100-150 ornaments to create a full and balanced look. This amount allows for a good mix of different sizes, colors, and textures to create a visually appealing and festive display. However, the exact number may vary depending on the style and design of your tree, as well as personal preference. It's always a good idea to start with fewer ornaments and gradually add more until you achieve the desired look.