Houseplants can survive without fertiliser, but they may not thrive. Plants generate energy through photosynthesis, yet they need minerals from soil to grow properly. In pots, that mineral supply depletes over time, unlike in the wild where roots access fresh nutrients from decaying leaves, rain and organisms. Adding fertiliser replaces what potted plants lose, according to gardening guidance. Garden centres stock many options: liquid concentrates, slow-release pellets, droplet bottles and specialist formulas. Some plant owners report their houseplants do fine without feeding. Others say fertiliser is essential for healthy growth.