Here’s a fun confusion-buster: carnivorous plants are not vegetarian energy-thieves. They make all their own food from sunlight, just like any normal plant. What they’re after when they catch a fly is something completely different - nitrogen.
Nitrogen is one of the most important elements in life. Plants need it to build proteins, DNA, and the green pigment chlorophyll. Most plants suck it up from soil, but in nutrient-poor bogs and swamps the soil barely contains any. Insects, on the other hand, are walking packets of nitrogen-rich protein.
A Venus flytrap fed regular flies grows bigger, greener and flowers more reliably than one that never catches anything. But starve it of insects entirely and it’ll still scrape by, just smaller and weaker. The bugs are basically vitamin pills, not a main meal.
