Although plants carry out photosynthesis to produce the sugars they need to survive, there is a more direct form of nutrition to maximise houseplant potential. Providing fertilizers to your housePLNTS ensures they remain happy and healthy.
Nutrition can be delivered via a granule that breaks down over time, or it can be added more directly via a liquid fertilizer. Generally, granules need to be applied once every few months, while liquid fertilizers should be applied every fortnight or so.
Read the instructions on the fertilizer you have to see what is recommended.