Hydroponics involves pumping a nutrient solution past roots anchored in some inert substance, or spraying the solution on roots dangling in the air - sometimes called aeroponics.
Semi/hydroponics involves a container of inert medium with a reservoir on the bottom, and watering the container with a nutrient solution frequently.
Plants are unable to grow without exogenous nutrients. They may have enough stored to survive for quite some time on pure water without additional nutrients, but they eventually die of malnutrition.
I think this happens frequently with house plants. People don't realize bagged house plant potting mixes lack nutrients, or have only a few that are rapidly exhausted. They water their plants but never fertilize. The plant withers away and people think they can't grow houseplants.
I've tried talking to people about fertilizing house plants. Some people refuse to do it, thinking they just don't need to.
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