Plants, as living organisms, are not located on the Celestial Sphere.

Here's why:

* The Celestial Sphere is a conceptual model: It's an imaginary sphere of infinite radius surrounding Earth, used to map the positions of stars and other celestial objects.

* Plants are terrestrial: They are part of Earth's biosphere, existing on the surface of the planet.

While we can observe plants from Earth and relate their position to the celestial sphere (e.g., a plant growing under a particular constellation), they are not *on* the celestial sphere itself.