Here's why:
* Species: A tiny moss is vastly different from a giant redwood tree.
* Age: A young seedling weighs much less than a mature plant.
* Conditions: The amount of water and nutrients a plant receives affects its weight.
To know the weight of a specific plant, you would need to measure it.
Would you like to know the weight of a particular plant, or are you looking for information on how to measure plant weight?