How do plants like green onions seem to grow forever when put in jar of water? I understand that plants get a lot of their carbon from the air (as per this question) but surely they need more than just carbon to grow new leaves.
The answer in the linked question mentions that plants in general get their mass from sources like water and nutrients like nitrogen and phosphorous, and ions.
However, if a plant is growing directly in [distilled] water where will it get those nutrients (like phosphorous and the ions) from?
Where does that extra mass come from?