Objects feel heavy due to gravity. Gravity is a force that pulls objects towards each other. The more massive an object, the stronger its gravitational pull.
Plants do not have a significant gravitational pull. They are much smaller and less massive than planets, and therefore their gravitational force is negligible.
Therefore, objects do not feel heavy on the surface of a plant because plants do not exert a significant gravitational force.
It's possible you are thinking about the weight of an object, which is the force exerted on it by gravity. An object will have the same weight on a plant as it would on Earth, as the gravitational force acting on it remains constant. However, the feeling of heaviness is subjective and depends on factors like the object's mass, the surface it's on, and the individual's perception.